# 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 179
1. ## math

use integer values of x from-3 to 3 to graph the equation y=2x^2=3 can you tell me the coordinates, then i can graph it, i just dont understand how to get them. thanks.

asked by NaTasha on April 10, 2017
2. ## trig

solve the equation of the domain 0¡Ü¦È¡Ü2¦Ð 3cos^2theta - 5costheta -1 = 3sin^2theta

asked by Amanda on April 9, 2012
3. ## chemistry

what is the balanced equation for the reaction of potassium dichromate and potassium hydrogen phthalate?

asked by rob on January 10, 2013
4. ## Maths

a) P is the point on the curve y= 2x^3 +kx -5 where x= 1 and gradient is -2. Find (i) The value of the constant k (ii) The equation of the normal to the curve at P

asked by Kelly on May 2, 2019
5. ## Algebra

Linear Equation -8x+4y=-12 Answer book states is y=2x-3 I am not arriving at this answer when I simpify

asked by G on February 22, 2008
6. ## geometry

The radius of a circle given C (4,-1) and (8,2). What is the equation that defines the circle if its center is at the fourth quadrant?

asked by dheah on October 31, 2016
7. ## math

Calculate the equation for a line that passes through the points (-2, -1), (4, 8) and (50, p). What is the value of p? Ok for the points -2,-1 and 4,8 i gotten y=3/2x+2 i don't know how to get the 50.p part please help me

asked by Plz help asap on September 29, 2016
8. ## Maths

Find the equation of the parabola with its axis parallel to x-axis and passing through the points (-2,1),(1,2),(-1,3)

asked by Angelina on February 14, 2016
9. ## gr 12 chemistry

write an equation for a reaction involving an aldehyde to illustrate a hydrogenation reaction.

asked by shelly on March 2, 2010
10. ## Math

What if I want a garden with 88 square feet and the length measures 11 feet. Is the equation for this 11wx8=88?

asked by Gail on February 25, 2016
11. ## Math

Jessica has 9 more nickels than dimes, and the total value of her coins is 1.50. How many nickels does she have. Write the best equation.

asked by Marcy on January 14, 2014
12. ## Chemistry

How many moles of H2 can be produced from 7.74g SrH2? equation:SrH2 + 2H2O = Sr(OH)2 + 2H2

asked by Melissa on September 14, 2010
13. ## math

Find an equation of the line that satisfies the given conditions. Through (−7, −12); perpendicular to the line passing through (−4, 0) and (0, −2)

asked by alex on September 7, 2014
14. ## geometry

The measures of the angles in a quadrilateral are represented by x, 2x, 3x, and 3x. Write an equation that would allow you to solve for the value of x. Solve for the value of x

asked by Anonymous on January 18, 2011
15. ## trig

Verify the equation is an identitiy: cot(x)tan(x+pi) - sin(pi-x)cos((pi/2)-x) = cos^2x Thanks

asked by Chris on April 27, 2011
16. ## Math

What unknown number makes these equation true. 447+99 =447+100-

asked by Alyssa on October 5, 2016
17. ## Last question, I swear! Math!

Write an equation or inequality. 1. The difference of 73 and a number x is 17 .. How would I write one for this? I really don't understand.

asked by Not putting it on September 15, 2010
18. ## chemistry

In the electrolytic refining of copper, write equation for the reaction of the impure copper.

asked by Shane on September 6, 2014
19. ## math

Solve the equation 8 cos^2 X -2 =0 given that 180< or equal to X

asked by lindsay on May 18, 2013
20. ## chemistry

i need a molecular, ionic and net ionic equation for this : K_3 PO_4 + BaCl_2

asked by jhong on March 23, 2012
21. ## math

Write the equation of the line that has the following Contains point (3,6) and is perpendicular to y = 2x + 4 --------------------------------------------------- I got that the slope was -1/2 but is the y-intercept really 15/2? can you even have this as a

asked by David on October 14, 2017
22. ## math

If it says: "five less than three times a number is 20 More than half a number" would the equation be 3n-5=n/2+20? If so what would the answer be? Please help this is a bit confusing!

asked by jeffery on January 6, 2014
23. ## Chemistry

I don't understand this one at all. Please help! For the equation: MnO2 (s) + 2 CO (g) → Mn (s) + 2 CO2 (g) 1. Calculate ΔG° at 25°C 2. Calculate ΔG° at 125°C

asked by Kate on April 7, 2015
24. ## Math

If h is hours and n is the number of radios remaining, complete the equation: n= ____ x h = ____

asked by Dee on January 20, 2016
25. ## graphing

given one point on the graph (-2/3,(2,5) and the slope, m=-3, develop an equation in te slope intercept format

asked by Pat on November 13, 2010
26. ## geometry

how can the slope formula help you remember the equation for the point-slope form of a line?

asked by nikki on January 20, 2011
27. ## Math

Hello. If I have the following table: Time(x) 18 27 72 81 Distance (y) 8 12 32 36 How would I create an equation relating the variables in the table? y= Please help. I have never done this before?

asked by Patrick on September 19, 2018
28. ## college alg

find the equation of a line that is perpendicular to line y=1/6x+6 and contains point (-7,0) y=? please show work so i can see how its done

asked by alli on September 4, 2012
29. ## Math

when doing inequality word problems does it matter what the order is to go in the equation. For example least to greatest or greatest to least?

asked by Anonymous on January 13, 2014
30. ## algerbra

Using point-slope form, write the equation of the line that passes through (2, –1) and has a slope of –5.

asked by desire on October 18, 2012
31. ## Algebra 2 Mannn

9x^2-y^2-72x+8y+119. how do i change this equation from general form to standard form.

asked by Miley on June 9, 2008
32. ## chem

Calculate [H3O+] for each of the following solutions. a)pH = 8.59 i got 3.00e-9 but it said it was wrong. what am i doing wrong. im using the equation 10-ph = [H30+]

asked by Beth on April 6, 2011
33. ## Math

Write an equation for the line in slope intercept form Slope:-2 passing through (-2,8)

asked by Lana on October 1, 2014
34. ## math

Find the variation equation for the variation statement. z varies directly as x and inversely as y; z = 3 when x = 24 and y = 40

asked by Anonymous on March 20, 2010
35. ## math

Find the equation of a line that is perpendicular to the line y=1/8x+5 and contains the points (-7,0) y= please show work

asked by caylan on January 6, 2013
36. ## Math

Write an equation of the line that is perpendicular to the line y=2x-1 and passes throgh the point (0,-3)

asked by Erin on May 22, 2011
37. ## critique reasoning

Alex decides that 21 divided by 3=7 is NOT a true equation. Is Alex correct? Explain

asked by Terry on March 4, 2015

the line containing the points x=5+2t and y=-3+t. write the slope-intercept form of the equation of the line

asked by jane casina on September 25, 2010

This is a little difficult... Graph the Function y=3 less than the absolute value of x+2 Obviously you cannot show me this on a graph, but I just need help with solving the equation... Thanks!!!

asked by Jackie on November 11, 2015
40. ## algebra

Can you help me find the solutions of the equation x^2 + 30x=1000...help me solve it step by step..

asked by Robbie on May 27, 2009
41. ## Geometry!

"The measure of an angle is 6 more than 3 times the measure of its compliment. i know the quation is X+3x+6 but how do i solve that equation?

asked by Danielle on April 3, 2012
42. ## algebra2

What is the equation of the line passing through (0, 2) and perpendicular to the line y = 4x – 3 in slope-intercept form?

asked by Rayniya on November 21, 2010
43. ## Linear Algebra

whats the exponential decay equation for 100 atoms that decay 1/20 per day

asked by Anonymous on January 12, 2012
44. ## algebra

-2x+5y=-15 Find the x- and y-intercepts and graph the equation plotting the intercepts. Please show all of your work.

asked by mary on July 17, 2011
45. ## math

for every 30 feet you descend in a cave, it gets 4 degrees colder. if you are at 8 degrees, how far have you gone. how do you write the equation?

asked by Anonymous on April 22, 2013
46. ## maths

solve the following equation by completing square x(square) + 5x - 84 Pls show steps x= or x=

47. ## algebra

Help me with this problem. Write an equation of line containing the given point and perpendicular to the give line (4-2); 9x+2y=3 help me with this.

asked by Johnnie on March 19, 2009
48. ## Geometry

Write an equation for the line with the given slpe that contains the given point. Graph each line. 1. slope 2,(2,-2)

asked by Denzel on October 1, 2007
49. ## Analytic Geometry

Find the equation of the circle, with radius 1, tangent to the line 3x+4y=5 and having its center on the line x+2y=0

asked by xavier on January 31, 2013
50. ## Geometry

The line m has the equarion y= 2x + 1. The line n is perpendicular to m and passes through the point A(2,1). Write an equation of n

asked by Marina on January 13, 2012
51. ## math

solve in three variables.. I'm very confused if what equation is the first to solve. 13y=10 x+y+z=39 16x+13z

asked by aldren on January 15, 2011
52. ## algebra

if jessica solved an equation and her answer was o=2 , explain to jessica what her result means

asked by Anonymous on December 14, 2010
53. ## algebra

which quadratic formula would be used to solve the following quadratic equation? 4x^2 - 5x = -2 can you show me the correct answer and how do it please

asked by gabriel on June 8, 2010
54. ## math

What is the product of all valid solutions of the fractional equation x/(45-5x)=1/[5(x-1)] I am guessing the answer is -9 because the two solutions would be -3 and 3 but Im not sure.

asked by anonymous on January 20, 2017
55. ## algebra

The equation f(x) = 4x2 − 16x + 9 represents a parabola. What is the vertex of the parabola? (2, −7) ( −2, 57) (4, 9) ( −4, −137)

asked by al on April 11, 2016

an equation in slope-intercept form of the line ia parallel to the y-axis and has an x-intercept of 3

asked by Anonymous on December 15, 2008
57. ## Math

Give the equation of the line that passes through point (-5, -1) and is parallel to the line y = - 14x

asked by Johnnie on November 15, 2009
58. ## Math

-8y = 2x -7 +9y +7= 2x Determine whether each equation represents a direct variation. If it does, find the constant of variation.

asked by Mike on November 28, 2016
59. ## math

Give the equation of the line that passes through point (-5, -1) and is parallel to the line y = - 14x - 7.

asked by jeng on November 15, 2009
60. ## Algebra 2

Solve the equation. Round answers to the nearest hundredth. log(7x+1)=log(x-2)+1

61. ## locus

if a moving point p is always equidistant from the point A(2,4) and the line y=-4, find the equation of the locus of p

asked by zoe on July 18, 2015
62. ## Algebra

Find the center and radius of the circle. Equation: x^2 + (y+7)^2=4 Formula for center at the origin is x^2+y^2=r^2 Is this what I use and how do I go about this?

asked by Carrie on April 18, 2010
63. ## math

Write an equation of a line that is perpendicular to the line y=3x-6 and goes through the point (-3,5) plz help me ...and explain how to do

asked by Anonymous on February 16, 2009
64. ## chemistry

When given qcal (2064 J), how do you calculate delta H (which equation is used)? ex. CaO+ H2O-> Ca(OH)2, what is delta H?

asked by brenn on November 18, 2014
65. ## Math

Choose any number for p. Determine whether the following equation is true. (2p-3)(p+4)=2p^2-5p-12 I don't think this is true. Am I correct?

asked by Cherie on November 18, 2014
66. ## geometry

how to write an equation in slope intercept form of the line through point P(8,20 with slope 4?

asked by chris on May 3, 2012
67. ## algebra

V=1/3*6300*7 solve for V The answer is V=14700 how do you change 1/3 to a decimal or use 1/3 to solve the equation?

asked by jen on February 14, 2011
68. ## Algebra 1A

Find the slope intercept of equation of the line that has the given characteristics. Slope 3 and y interceot 0,7

asked by Anonymous on September 10, 2011
69. ## Trig

find all solutions to the equation √3 csc(2theta)=-2 Would the answer be π/6 + 2πn, 5π/6 +2πn or π/6 + πn, 5π/6 +πn? or neither?

asked by Bob on July 10, 2012
70. ## Math

The following table shows a proportional relationship between w and z. w=18 and z=2. Write an equation to describe the relationship between w and z.

asked by Maya on February 25, 2018

simplify the following equation using boolean laws and rules: x=~(A(+)B) + ~(AB)+~((A(+)B)AC)+(~A)C (+) means plus in the circle ~ means not

asked by Anonymous on February 13, 2019
72. ## math

the tripled product of 6a and b^2. I got 216a^3b^6, but my teacher says that this is wrong. my equation is \(6ab^2)^3 is this wrong?

asked by Emma on December 16, 2017
73. ## Algebra

For each equarion, write the equivalent equation that expresses y in terms of x (Problem A) 3x+5x-y=5y y= (Problem B) 3x(5-x)= x-y

asked by Kirby on September 7, 2008
74. ## Analytical Geometry

Find the equation of the circle that passes through the point of intersection of the circles x^2+y^2=2x, x^2+y^2=2y and contains the point (2,1)

asked by Dan on June 24, 2018
75. ## math

find the two ordered pairs from this equation. y+x=-2 then give the ordered pair of the y intercept?

asked by KiKi on March 28, 2010
76. ## math

Solve the following equation for theta (θ) over the given domain: √3 sin 2θ = cos 2θ Domain: 0 < θ < 360

asked by sweetG on July 5, 2008
77. ## equation

what is the equation of calculating 5/90 lottery winning numbers if these numbers were selected for the first week 24-13-6-60-70

asked by patrick on March 28, 2011
78. ## Precalculus

Solve the equation for the indicated domain. sec(theta+81 degrees)=2 Theta E[0,360)

asked by Anonymous on November 17, 2013
79. ## Chemistry

N2(g) + O2(g) --> N2O5(g) (a) Consider the unbalanced equation above. What is the maximum mass of N2O5 that can be produced when 43.0 g of N2 and 43.5 g O2 react?

80. ## Math

I have to solve the equation by finding a common base. 9^(x2-1)= 1/27^x Do i cross multiply and solve for x?

asked by kim on February 4, 2012
81. ## Algebra

Write the equation of a line that is perpendicular to the given line and that passes through the given point. Y-3=8/3(x+2);(-2,3) I have no clue :,(

asked by Alexis on December 12, 2015
82. ## Algebra 2

Write in standard form an equation of the line with the given slope through the given point: slope = -4;(2,2)

asked by Heather on September 9, 2009
83. ## chemistry

asked by joseph on March 10, 2011
84. ## Geometry

Write an equation in slope-intercept form of the line through point P(6, –1) with slope 4. A. y = 4x – 25 B. y + 6 = 4(x – 1) C. y + 1 = 4(x – 6) D. y = 4x – 1 How would I do this?

asked by Maya^.^ on March 9, 2016

1.)Determine the x- and y- intercept of each equation. (if u can please show me a step by step answer so i understand it:) a.) 9x=54-6y b.) (x/5)-(y/10)=2

asked by Nini on February 2, 2009
86. ## Calculus

Find the scalar equation of a plane that is perpendicular to plane r=(-2,1,3)+s(0,1,1)+t(-1,0,3) and also intersects it along the line (x-3)/2=(y+1)/-3,z=1

asked by Zac on July 29, 2014
87. ## Math

Find an equation of the curve that satisfies the given conditions: (d^2y/dx^2)=6x, the line y=5-3x is tangent to the curve at x=1

asked by Tim on July 29, 2014
88. ## chemistry

When the following equation is balanced the coefficient of CaO is ... CaO + P4O10 > Ca3(PO4)2

asked by . on March 10, 2011
89. ## Math HELP

Write the equation of the line (in slop/intercept form) that has a slop of 7 and goes through the point (6,4).

asked by David on December 13, 2012
90. ## math

determine the equation of each line: a) slope 3.4 passing through point (-2, -4) b) slope -5 and y-intercept -0.7

asked by jessica on August 18, 2012

Consider the equation 3x+5y=k, what values could k so that the x-intercept and y- intercept on the equations graph would both be integers. explain.

asked by Monkeylover:) on November 4, 2010
92. ## Math

How do you find the equation of a line in standard form (ax+by=c where a, b, and c are integers) for the line passing through (1,5) and (-3,1)?

asked by Anonymous on August 29, 2011
93. ## Math

Determine the equation of the parabola with roots 2+sqrt(3) and 2-sqrt(3), and passing through the point (2,5).

asked by Emily on August 23, 2010
94. ## maths

solve the following equation for the value of theta between 0 degrees and 360 degrees.For 5 + 3cosec^2theta =8

asked by njovu on February 27, 2012
95. ## Math

Write an equation in slope intercept form with a y-intercept of 3 and is perpendicular to the given line

asked by Hannah on November 21, 2013
96. ## Calculus

Find an equation of the tangent line to the curve at the given point. y = sin(sin x), (pi, 0)

asked by Nyke on November 7, 2011

select the equation of the line passes through the point (2,6) and is perpendicular to the line x=4. Answers y=4 y=6 x=6 x=2

asked by jasmine on November 30, 2015
98. ## Math

Translate into an equation use x to represent an unknown number two thirds of a number is negative 28

asked by Atavia on July 27, 2016