# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 182
1. ## Math

Use the diagram below. Write an equation using the angle measures shown. Then, find the measures of LAVB and LBVC

asked by Ashley on October 5, 2016
2. ## chem

2Na(s) + 2H2O(l) ==> 2Na^+(aq) + 2OH^-(aq) + H2(g) What is the the net ionic equation because it doesn't look like their is any spectator ions.

asked by Lenny on April 21, 2009
3. ## maths

helo sir/madam can u help me to solve this problem solve the following simultaneous equation logx Y+logy X=5/2 xy=64

asked by fizz on April 15, 2014
4. ## Chemistry

How many moles of PCl3 can form from a mixture of 5 mol of P and 6 mol of Cl2 according to the equation 2P + 3Cl2 ¨ 2PCl3

asked by Dan on April 8, 2010
5. ## Math

Use the Intermediate Value Theorem to show that there is a root of the given equation in the specified interval. cos x = x. How do I begin this problem? According to the theorem, a=0, b=1 and N=x?

asked by KC on September 2, 2012
6. ## MATH

Which equation shows the correct use of power of products property? a) (2x^5y^2)^3 = 6x5y^2 b) (2x^5y^2)^3 = 6x^15y^6 c) (2x^5y^2)^3 = 8x^8y^5 d) (2x^5y^2)^3 = 8x^15y^6 Is it D? I am very counfused

asked by Topkitty21 on February 1, 2017
7. ## Math

Insert parentheses and/oraddition signs to make each equation true. Remember that parentheses can indicate multiplacation. A. 3 2 4 1= 13 B. 3 2 4 1= 21 C. 3 2 4 1= 12 D. 3 2 4 1= 10

asked by Kylie on October 25, 2017
8. ## Calculus

Consider the curve -8x^2+5xy+y^3=-149 1. Find Dy/dx 2. write an equation for the line tangent to the curve at the point (4,-1)

asked by Matt on January 30, 2012
9. ## Chemistry

How many moles of hydrogen are consumed when 40.0 L of hydrogen chloride gas are produced in the following equation? H2(g) + Cl2(g) 2 HCl(g)

asked by Kiesha on November 14, 2010
10. ## math

Could someone help me solve this Absolute Equation? Please? I really can’t figure it out and I would really appreciate any help... Question~~ Evaluate the given expressions when a = 3, b = -3, c = 4, and d = -1 (a/c)|c| + b – d My answer~ (a/c)|c|+b-d

asked by Abby on October 5, 2015
11. ## Physics

A toy car coasts uphill at 2.34 m/s. It accelerates at -.34 m/s squared. How long will it take the car to stop.What equation would I use.

asked by Ben on January 28, 2011
12. ## ap calc

find the equation of all horizontal tangents to the curve y^2 = (x^2+4)/x, if any exist this is what I have so far: xy^2= x^2+4 2xydy/dx = 2x-y^2 dy/dx = (2x-y^2)/2xy (2x-Y^2)/2xy = 0 2x- Y^2 = 0 I don't know what to do after this

asked by Anonymous on October 8, 2014
13. ## Math

x=natural gas it dropped by 2cent then increased by 25cents then dropped 43cents...how do I set up this equation?

asked by Paul on January 29, 2016
14. ## Math

A baker uses 4 berries for every 1 muffin. which equation can be used to find the number of berries, b, needed to make m muffins? A. b = 4/m B. b = 4m C. b = 1/4m D. b = m + 4

asked by grey on October 13, 2017
15. ## Physics - Range of projectile motion

What properties of projectile motion must you apply when deriving an equation for the range of a projectile? (is it the trignometric identity??)

asked by Shaila on August 21, 2010
16. ## College Algebra

I need to insert 1 or more sets of parenthesis or brackets to make the following equation equal 0 and then equal 1: -2^2+2^2/1/3-1/3*3-4 I have tired every combination I could think of and can't get it right.

asked by Kelsie on March 27, 2017
17. ## math help!!!!

4. Ernesto loses 14.5 pounds in 7 months. Now he weighs 156.5 pounds. Which equation can be used to find how much he weighed before?

asked by Jman on November 20, 2012
18. ## Chemistry

I need to balance this equation by redox reactions with half reactions method NH4ClO4 + Al --> Al2O3 + AlCl3 + NO

asked by Krystal on October 23, 2011
19. ## Algebra

What is the standard form of the equation of the line passing through the point (-1,-2) and perpendicular to the line y= - 2/3x - 1? a. 3x-2y=-1 b.3x-2y=1 c.3x+2y=1 d.3x+2y=-1 I don't understand, can anyone help me please?

asked by Christina on October 13, 2011
20. ## algebra

1750 divided by 2 times 1/5 equals x divided by 2/6 is that a 3 step equation and should the answer turn out to be 58.333333333

asked by anonymous on October 28, 2007
21. ## Intro to Chemistry

Given the following chemical equation, determine how many grams of N2 are produced by 8.58 g of H2O2 and 5.62 g of N2H4. 2H2O2(l)+N2H4(l)=4H2O(g)+N2(g)

asked by Tammy on November 10, 2014
22. ## math 113

an object is thrown upwards and its height h(t) in meters after t seconds is given by the equation h(t)=1+4t-5t^2 .when the object hit the ground.

asked by chrop on November 25, 2016
23. ## algebra

Solve each absolute value equation or inequality and choose the correct answer from the choices provided. |x| + 5 = 18 A. 5 or –5 B. 13 or –13** C. 18 or –18 D. 23 or –23 answer **

asked by yeet on October 23, 2018
24. ## algebra

find f(x) = –x3 + x2 + 2x + 7, find f(–3), f(0), and f(2) Wouldn't you just substitute the value of x (-3, or 0, or 2) into the equation and compute? Can you just show me how to do the first one....my brain is fried at this point

asked by Dori on August 9, 2007
25. ## Algebra 2

I want an Quadratic equation for this : h hight is at 35000 ft. t time is on 120 sec. zero is axis of symmetry, so c is 35000. Thank you.

asked by Umar on May 10, 2016
26. ## algebra

Write an equation of the line containg the given point and parallel to the given line express answer in the form y=mx+b (7,8),x+2y=7 Please help

asked by muff on November 28, 2009
27. ## chemistry

What is the amount of H2O that can be produced by combining 89.7 of each reactant in the following equation: 4NH3(g) + 5O2 (g)----> 4NO(g) + 6 H2O(g)

asked by Angie on March 15, 2013
28. ## Algebra 1

an electrician charges (f) an initial fee of \$20 and then \$30 per hour. Which linear equation represents this if (h) represents hours

asked by Emerald on December 14, 2015
29. ## Math

A line has a slope of 6/7 and a y-intercept of -5. Which of the following is the equation of the line? 7x - 6y = -35 7x - 6y = -5 6x - 7y = 35 6x - 7y = -35 I'm honestly not sure with this, I'm thinking that it's 7x - 6y = -5.. Not sure though. Also, could

asked by L on October 31, 2012
30. ## math

given the following equations x,y data pairs find the least squares equation fo these data. use 3 decimal places. Y equals what + what x (3,3)(4,5)(6,8)

asked by jeffrey on January 19, 2011
31. ## calc

Each of the regions A, B, and C bounded by f(x) and the x-axis has area 5. Find the value of ∫2 [f(x)+3x^2+2]dx. −4 I know to solve I can find the antiderivative of the equation but im not sure how to do this because of the f(x) in the parentheses.

asked by DD on November 16, 2014
32. ## algbrea

translste the sentece into an equation and slove it.if 4 times a number is decreased by 9, the result is 19. find the number?

asked by cody on October 16, 2009
33. ## trig

the points (0,3), (1.8, -.365), (2, -.79) (4.5, -1.923) li on a line. Write the equation of the line in slope intercept form.

asked by jerson on September 15, 2008
34. ## MATH

Find the number of words which can be formed by using the letters of the word EQUATION if each word has to start with a vowel.

asked by michele on April 21, 2011
35. ## college algebra

given the function f(x)= x^3+3x find the rate of chnge between the two values x:1 to 2 find the equation of a secant line containing the given points (1,f(1) and (2,f(2))

asked by zachary on November 2, 2012
36. ## chemistry

Potential of a cell is 0.1776 volts Pb|Pb2+(??M)||Pb2+(1.0M)|Pb I know i have to use Nernst's equation .. i just have no clue how to attempt this :S

asked by joshua on March 29, 2011
37. ## Chemistry

If 15.0 kJ are released when 1.40 g of F2 reacts with an excess of SiH4, complete the thermochemical equation below. SiH4(g) + 2 F2(g) SiF4(g) + 4 HF(g) ÄHrxn=?kJ

asked by Rach on March 8, 2010

Solve the equation:(x+3)/-3=(x+3)(x-1) Divide both sides by (x+3), multipy both sides by -3. I Will be happy to critique your work. will it be x=-2? no. 1=-3(x-1) 1=-3x+3 -2=-3x x= 2/3 check that.

asked by Margie on June 29, 2007
39. ## algebra

write an equation in slope-intercept form for the line that is parallel to the given line and that passes through the given point. y=1/2x+5:(4,-3)

asked by genny on January 17, 2014
40. ## precalcus

what is the rational equation of a function with intercepts at (8,0) and (0,0.16) and a horizontal asymptote at y=0.5 and a vertical asymptote at x=3 and a removable discontinuity at (3,-1)

asked by Ashley on November 11, 2015
41. ## math

you competed in a 3.9 kilometer race you finished the race in 0.4 hours. which equation can you solve to find your speed, R?

asked by john on October 17, 2009
42. ## Math

Choose the equation you can use to solve the following problem each cupcake cost \$4.00. How many cupcakes,x, are puchased if the total cost is \$36.00 A 4+x=36 B 36-X=4*** C 4X=16 D X/4=36

asked by NOICE on November 4, 2018
43. ## Another Algebra (urgent!)

Find A if the graph of the equation Ax + 3y = 5 is parallel to the graph of 5x - 2y = 4 I tried to solve the problem, but I couldn't really get a good answer. Thanks!

asked by Bella on January 14, 2009
44. ## Calculus

Determine the equation of the line perpendicular to the tangent line to the function f(x) = 1/2 (e^x)at the point on the curve where x=ln3.

asked by Abigail on June 15, 2010
45. ## Math

bills weight is 102lbs. this is 10 less than 3 times his little brothers weight. How much does his little brother weigh? write an equation

asked by MEH on December 17, 2017
46. ## Math

Write an equation in slope intercept form of the line that is perpendicular to the given line and that passes through the given point 3x-4y=8 ; (-6,5)

asked by Ava on April 20, 2014
47. ## algebra

\$2000 principal earning 3% compunded after 6 years? how do i solve this? i don't need answers i just don't know what the equation is.

asked by quesia on September 3, 2016
48. ## chemistry

Consider the following equation: 4 NH3 (g) + 5 O2(g) 4 NO (g) + 6 H2O(g) (a) How many liters of oxygen are required to react with 2.5 L NH3 ? Both gases are at STP.

49. ## Chemistry

if you are given the equation 2NO(g)+o2(g)->2NO2 and you are given the volume of NO is 150mL. how do you find what the volume of O2 is required (at the same pressure and temperature)?

asked by Gene on November 5, 2014
50. ## algebra 2

If someone can help me understand this question I'd appreciate it. Solve the following equation. Its a 3x3 matrix that = x^2 first row is 0 0 -1, second row 3 x 0, 2 0 3. Im not quite sure how to find x so i can figure out what x^2 is.

asked by Janet on August 17, 2015
51. ## Math HELP

Choose the equation you can use to solve the following problem each cupcake cost \$4.00. How many cupcakes,x, are puchased if the total cost is \$36.00 A 4+x=36 B 36-X=4*** C 4X=16 D X/4=36 PLEASE HELP ME

asked by NOICE on November 4, 2018
52. ## chemistry

Write the net ionic equation for aqueous potassium phosphate and aqueous calcium nitrate.

asked by Braidy on January 8, 2018
53. ## Algebra 1

write an equation of the line containing the given point and perpendicular to the given line (6,7);6x+=9 I am having a terrible time figuring out the last part. I would appreciate any help. Thank you.

asked by Esther on January 26, 2011
54. ## College Algebra

Use rational root theorem and the factor theorem to help solve the following equation X4-2x3-13x2+38x-24=0

asked by Ruth on November 6, 2011
55. ## Math

Write the standard for of the equation of the circle that passes through the points at (0,8),(8,0),and (16,8). Then identify the center and radius of the circle.

asked by Sally on July 2, 2009
56. ## math

Write an equation of a line perpendicular to line AB below in slope-intercept form that passes through the point (7, 6). A (0,1) B (-2,5)

asked by Henry on March 26, 2014
57. ## math

ABCD is a quadrilateral inscribed in a circle, as shown below: What equation can be used to solve for angle A? (x + 16) + (6x − 4) = 180 (x + 16) + (x) = 90 (x + 16) − (2x + 16) = 180 (x + 16) − (x) = 90

58. ## Precalculus

How can I type this equation in the graphing calculator? y=pi(25-x)^2 • 2x Note, the 2x is NOT multiplied by 2.. Show how I can type this in .. Parantheses and other notions ......

asked by Anonymous on May 29, 2014
59. ## Algebra

asked by Student on April 9, 2018
60. ## Math

I'm unsure how to solve this... can someone help me? Match the equation with its graph. −6/7 x - 1/2 y = 3/7 The answers are graphs, so I'll type the coordinates of the graphs here. A.) -1, 4; -6, 4 B.) -1, -4; 4, 6 C.)-4, -6; 4, 8 D.) -4, 6; 2, -4

asked by Abigail on December 10, 2015
61. ## Maths

Point P(-8,-3)and Q(6,9)are joined by a straight line.Find the equation of the line joining the midpoint of PQ to the origin.

asked by Shane on November 27, 2012
62. ## Math

Write the equation of a line in slope intercept form that is parallel to the given line and passes through the given point. y = 2x + 3 (1, 7)

asked by Jan on December 13, 2017
63. ## Algebra II

If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the third equation. 2x - 3y + z = -4 2x - 2y + z = -1 x - 2y + 3z = -6 5x + 7y = 6 y - 4 = -1 -y - 1 = -4

asked by Asianthatsuxatmath on January 17, 2014
64. ## Math

Sum of 2 consecutive integers is 59. Write an equation that models that situation and find values of both integers

asked by John on October 1, 2013
65. ## Science

How does the principle of conservation of mass relate to chemical reactions? What information does a chemical equation give you?

asked by Khaliyl on October 27, 2018
66. ## Math

solve equation in interval. sec x = -3 -¦Ð ¡Ü x < ¦Ð the answer is x = -1.911 and 1.911 could someone please write the steps to solving this

asked by Amy on September 4, 2011
67. ## Math

Solve the following equation =0.017=2x^2/(0.0550-x)(0.165-x). I was told it was 0.00196. But I got like 0.00247. Is 0.00196 correct?

asked by John on March 12, 2018
68. ## mathematics for management

helo sir/madam can u help me to solve this problem solve the following simultaneous equation logx Y+logy X=5/2 xy=64

asked by shiha on April 15, 2014
69. ## chemistry

how to balance this equation? (NH4)2Cr2O7 ---- Cr2O3 + N2 + H2O plz tell step by step.i m a beginner

asked by abdullah on May 6, 2010
70. ## algebra

If the lenght of a rectangle is 15 inches longer than its width whats an equation to represent the area of the rectangle?

asked by LC Clark on January 6, 2010
71. ## Algebra

I don't know how to solve 12x(2)-15x=0 using the quadratic equation ax+bx+c=0 with this question I am unsure of what a, b and c are supposed to be, therefore I do not know how to solve this! Please help!

asked by Liz on November 30, 2009
72. ## chemistry

The equilibrium constant for the chemical equation is K = 4.90 at 199 °C. Calculate the value of the Kc for the reaction at 199 °C. N2(g)+3H2(g)=2NH3(g) Kc=?????

asked by moe on November 9, 2014
73. ## Chemistry

Write a balanced equation for the formation of boehmite (ALO2H) from aluminium ions and hydroxide ions.

asked by Zen on June 4, 2012
74. ## Math

Solve the equation for x in the interval 0

asked by Diana on January 11, 2010
75. ## WAVE OPTICS

A traviling wave is discribed by the equation Y= exp(-az^2-bt^2-2underadical(ab zt)) 1,in what direction is the wavetravelling 2,what is the wave speed

76. ## math

A ball is thrown vertically into the air so that its height s after t seconds is given by the equation, s=-1/27(t^2)+4√t. Find its maximum height.

asked by Anonymous on October 11, 2016
77. ## Algebra

Which is the easiest way to figure a quadratic equation; graphing, quadratic formula, completing a square and factoring?

asked by Marysvoice on February 4, 2008
78. ## Calculus

A ball is thrown vertically into the air so that its height s after t seconds is given by the equation, s=-1/27(t^2)+4√t. Find its maximum height.

asked by Glen on October 11, 2016
79. ## Chemistry

Given the following equation: 2KClO3---> 2KCl+3O2 How many moles of O2 can be produced by letting 12.00 moles of KClO3 react?

asked by Nick on February 8, 2011
80. ## Algebra

The equation of the line that goes through the point ( 2, 5 ) and is parallel to the line going through the points ( -2 ,4 ) and ( 6 ,2 ) can be written in slope-intercept form y = mx+b with: m = b =

asked by kim on June 9, 2015
81. ## AP Chem

What is the net ionic equation when NaOBr is dissolved in water and the Ksp if the Ksp of the dissocataion of HOBr is 6.4 * 10^-6

asked by james on March 27, 2011
82. ## Another Geometry question

B is between A and C. AB=4x+3 BC=3x-2 AC=57 What is the value of x? Solve the relationship AB + BC = AC Substitute the appropriate algebraic expressions for the line lengths. The result will be the equation 7x + 1 = 57 Solve that.

asked by Jim on August 4, 2007
83. ## Calculus

I want to know how to find the local linearization. So in this problem I'm doing, I'm given the f(x) equation and it says "about x = 0" I'm suppose to approximate value of f(0.3) Are there specific steps I need to take to go about this problem?

asked by Joseph on October 10, 2016
84. ## math

the diagram shows triangle ABC point c has coordinates (4,7) and the equation of the line AB is x+2y=8 find the coordinates of B

asked by Gynie on December 15, 2015
85. ## Algebra

What is the equation for this situation. the cost c, in dollars of a car rentalis equal to 9 dollars plus 1/4 the miles driven, m

asked by Poochie on July 14, 2011
86. ## trig

what are the values of the angle in the interval 0

asked by conor on May 30, 2013
87. ## Physic

From equation x= A sin wt, prove that the acceleration of SHM is a= -w^2x w is omega actually.. 2.using relationship between velocity, v and displacement, x prove that v=w(A^2-x^2)^1/2

asked by Syam on September 4, 2014
88. ## algebra

6x+5y=17 find the equation, in slope-intercept form, for the line which is parellel to this line and passes through the point (-10,3)

asked by michael on September 27, 2012
89. ## Chemistry

Identify the equation for which Keq = [Cu+]2[S2-]. A) CuS(s) ⇌ Cu2+(aq) + S2- (aq) B) 1/2Cu2S(s) ⇌ Cu+(aq) + 1/2 S2- (aq) C) Cu2S(s) ⇌ 2Cu+(aq) + S2- (aq) D) Cu2S(s) ⇌ Cu+(aq) + 2 S2- (aq) E) none of the answers

asked by Mimi on December 10, 2016
90. ## trig

finding the equivalent polar equation 2x+3y=6 I got r=6/2cos(theta)-3sin(theta) can anyone check plz

asked by stacey graham on April 26, 2010
91. ## conics

Explain which conic section this equation and explain how to solve it: 12x^2-18y^2-18x-12y+12=0

92. ## trigonometry

Find all the angles between 0 degrees and 360 degrees which will satisf y the equation: 5tan^2 y +5 tan y = 2 sec^2 y

asked by lindsay on May 2, 2012
93. ## math

The sum of two consecutive integers is –49. Write an equation that models this situation and find the values of the two integers.

asked by brittany on March 19, 2015
94. ## math

solve the system of equation by graphing then classify the system as consistent or inconsistent and as dependent or independent 8x-4y=-20 4y-8x=-20

asked by DD on July 22, 2009
95. ## Calculus

Find the vector equation of the line that passes through the point (2,-1,7) and is parallel to the line of intersection of the planes x + 2y - 3z = -6 and 3x - y + 2z = 4

asked by J on May 7, 2012
96. ## algebra 2

Explain which conic section this equation and explain how to solve it: 12x^2-18y^2-18x-12y+12=0

97. ## Pre calc aesthetic quadratic stuff

two numbbers have sum of 9 and product of 20. What singlevariable quadratic equation in form of ax^2+bx+c=0 can be used to represent the product of the two numbers

asked by Sik-kunt zyzz on March 28, 2016
98. ## algebra

If you have a Pelican that weigh 30lb how would you find the wingspan of the Pelican with the rational exponent equation L=2.43*W^0.3326

asked by Teresa on November 24, 2010
99. ## chemistry

How to do this equation!? Ok if you have 0.125g of copper at 23ºC. How much energy is needed to convert this copper to a temperature of 455ºC?

asked by Anonymous on January 30, 2014
100. ## Algebra

Identify the type of conic section that has the equation 9x^2 + 25y^2 =225 and identify its domain and range.

asked by Anonymous on December 4, 2016