# 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 154
1. ## Maths

Just need a bit of help understanding what exactly i have to do here to work this out. Rearrage the following equation and hence state the gradient and the y-intercept. 2y = 8x + 10 Do i just go: y = mx + c 2y = 8x + 10 y = (8x + 10) /2 y = 4x + 5 or do i

asked by Nat on January 27, 2009
2. ## algebra

For the equation 9x + 15y = 4(2x - 7), the y-intercept is at the coordinate (0,y). What is the value of y? Type in your answer as a decimal rounded to the nearest hundredth.

asked by Kelsay on August 29, 2011
3. ## calc 1

fine the slope intercept equation of the tangent line to the curve by the relation 5x^3+10y^2=8x^5+2y at points (1,1)

asked by Sam on June 11, 2014

Find the equation of the circle incribed in a triangle, if the angle has its sides on the lines: 2x + y - 9 = 0, -2x + y - 1 = 0, and -x + 2y +7 = 0. Draw the figure.

asked by Jnr John on August 18, 2014
5. ## Chemistry

Why does equilibrium shift to the left when AgNO3 is added to the equation Co(H20)6 (aq) + 4Cl- (aq) CoCl4 (aq) + 6H2o(l)?

asked by Nancy on April 8, 2012
6. ## Math

Write and solve an equation to find how much water Montana average 3 month temperature is then minnesota

asked by Stella on December 11, 2016
7. ## Calculus 1

Use implicit differentiation to find an equation of the tangent line to the curve at the given point. x^2+2xy-y^2+x=6 , (2,4) (hyperbola)

asked by TayB on September 29, 2015
8. ## algebra

Ok so ive gotten this far on finding the points of (2004, 3370) and (2007, 3552) can someone help me find out the equation in y=mx+b form please

asked by mikey on September 21, 2008
9. ## algebra 1

i know that the slop intercept form is y-y1=m(x-x1) i have to write an equation for a line that has a slope of 6 and contains the point (-8,-7) even with the formula i don't now how, HELP!!!!

asked by lisa on January 19, 2010
10. ## chemistry

Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2. how would i set this up?

asked by s. on June 12, 2017
11. ## Calculus 1

Use implicit differentiation to find an equation of the tangent line to the curve at the given point. x^2/3 +y^2/3 =4 (-3sqrt(3),1) (astroid)

asked by TayB on September 29, 2015
12. ## math

If the area of rectangle is 24 sqm and its perimeter 20 m.Fram the quadratic equation find lenght and breath.

asked by poonam on November 7, 2016
13. ## Math

The volume of seed in a bird feeder is represented by the equation V = 12(24-h) Q: Make a table of ordered pairs (h,V)

asked by Math on February 8, 2017
14. ## Math

Write an equation to model: The temperature of hot water placed in the freezer is 80 'C and it decreases at a rate of 8' C per hour

asked by Angela on November 9, 2016
15. ## Math

If y = x^3 + 2x^2 if reflected across the line y =x, what is the resulting equation? This is what I have so far: x = y^3 - 2y^2 x = y^2 (y - 2) x/(y-2) = y^2

asked by H on July 4, 2017
16. ## Calculus

If ln(x^2-15y)=x-5+5 and y(-4)=1 find Y prime(-4) by implicit differentiation thus the equation of the tangent line to the graph at the point (-4,1) is y=

asked by Sarah on March 21, 2017
17. ## chemistry

Write the balanced equation for the combustion of C2H5(NH2)CO2H . The nitrogen is converted to N2O4

asked by joan on September 21, 2011
18. ## Chemistry

if you have 9.50x10^25 molecules of KClO3 how many grams of KCl and O2 will you get? The balanced equation is 2KClO3 = 2KCl + 3O2

asked by Emma on April 6, 2014
19. ## Chem

What is the balanced net ionic equation for aluminum foil reacting with hydrochloric acid ? (with steps please)

asked by Amanda on September 8, 2015
20. ## ALGEBRA

Without graphing, identify the slope and the y intercept for the line assoiciated with each equation or table of values: 5x + 20y = 60 x y1 0 6 1 10 2 14 3 18 4 22 5 26 6 30 X=0 PLEASE HELP ME!!!

21. ## MATH

HOW DO I SOLVE A QUADRATIC EQUATION BY FACTORING? Do you have a specific one? You factor it in this form: (x-a)(x-b)=0 then both factors , x-a, and x-b can be set equal to zero, and then x=a, and x=b.

asked by ANGEL on March 21, 2007
22. ## DRWLS

cAN YOU LOOK AT THE PREVIOUS POST. i am completely lost towards that equation...how do i even solve it because then i would have to cross multiply or cancel and that will give me zero.

asked by jas20 on February 25, 2007
23. ## chemistry

what is the sum coefficient and balanced equation of : Co(OH)3+Na2CO3 my answer is 3Co(OH)3+ 3Na2CO3---> 3CoCO3+ 3Na2OH

asked by lydia on October 9, 2012
24. ## chemistry 110

Write the net ionic equation for NaOH to form soluble Na2SO4 along with H2O as products.

asked by Kim K on November 9, 2010
25. ## college algebra

find the equation for the line with the given properties. Express in slope intercept form. Containing points P=(-3,-4) anda Q=(-1,-1)

26. ## Chemistry

What volume of 0.1209 M HCl is necessary to neutralize 0.5462 grams Ca(OH)2? Include a balanced chemical equation.

asked by Jake on February 19, 2009
27. ## Calculus

Use implicit differentiation to write the slope-intercept equation of the tangent line to the graph of (x^2+4)y=8 at the point (2,1):

asked by Julie on March 20, 2013
28. ## Mah

The area of a circle depends on the radius. Use the equation A(r) = 3.14 r2 to compute A(8). Round your answer to the nearest hundredth.

asked by Njp on June 29, 2017
29. ## Algebra 1

Please help. I need to convert this text into a trinomial equation. I have a 10x12" photo. I want to scan it and reduce it by 1/8 of the original size. Thanks

asked by Viva on February 3, 2009
30. ## math

This is about ellipses: If a problem gives you two foci points and the length of a spring, how do you find the equation and the vertices of the ellipse?

asked by help plzz on June 28, 2017

Express the fraction(s) 6/7 and 12/10 as the sum of two or three equal fractional parts. Rewrite each as a multiplication equation. Any help is appreciated.

asked by Carol on January 19, 2014
32. ## PreCalc

Find the equation of the line in the xy-plane that goes through the origin and makes an angle of 1.2 radians with the positive x-axis.

asked by Zack on September 8, 2015
33. ## Math

Identify th equation of the parabola whose focus is at (5,-1) and whose directrix is x=3 I don't see any examples of this kind of problem. is this right? (x-5)^2+(y+1)^2=(x-3)^2 so -10x+25+y^2+2y+1=-6x+9 4x=y^2+2y+17

asked by Anonymous on September 30, 2008
34. ## Chemistry

Hydrofluoric acid etches glass by reacting with the silica in it according to the following equation. H° = 54.5 kJ and S° = 436.5 J/K Calculate G° at 25°C for this reaction.

asked by Melissa on November 9, 2010
35. ## Calculus

Use implicit differentiation to write the slope-intercept equation of the tangent line to the graph of (x^2+4)y=8 at the point (2,1):

asked by Julie on March 20, 2013
36. ## Chemistry

What volume of 0.1209 M HCl is necessary to neutralize 0.5462 grams Ca(OH)2? Include a balanced chemical equation.

asked by Kourtney on February 19, 2009
37. ## chemistry

Can someone help me with this question? what two conditions must be met by a thermochemical equation so that its standard enthalpy change can be given the symbol delta Hf?

asked by Leslie on October 12, 2010
38. ## ALGEBRA

Using x as the variable, write the equation or inequality that would correctly solve this problem. Eight times what number is greater than 72?

asked by JD JOHNSON on June 25, 2014
39. ## math

Describe the steps to graph the direct variation equation y = – 3x. In the formula d = rt, what do each of the letters stand for and how do they relate?

asked by sakovia on November 8, 2010
40. ## physical science

600J of work hoisting a 20kg bale of hay, what height was it lifted? how can I calulated this equation?

asked by maya on March 12, 2009
41. ## Algebra

Find the equation in slope-intercept form of the line that is the perpendicular bisector of the segment between (-3,4) and (3,-8) Can you help me figure this out? Thank you!

asked by Student on March 13, 2014
42. ## Math: Linear Equation

I have not learned this yet in class and I am stuck on this homework problem. Graph the linear equation by using a table of solutions. 3x-4y=12

asked by Ashley on May 20, 2014
43. ## Algebra

Solve for x in the following matrix equation. [5x-8 1] = [2 1] [3 4m-1] [3 7m+6] How do you do this? I hardly know anything about this... The packet I got that was supposed to help me understand matrices and stuff just made me more confused.

asked by Nikki on July 17, 2017
44. ## algebra

The following equation is used to find c, the total cost for printing a quantity of high school yearbooks, b. c=5b+200

asked by Luis on June 12, 2014
45. ## Chemistry

How do I write ZnSo4(aq)+Na3Po4(aq)---> Zn3(Po4)2(s)+Na2S04(aq)as a net ionic equation balanced?

asked by Crystal on October 9, 2012
46. ## Math

A student is asked to find positive integer solutions to this equation: 2 * 3 √x = 5 √y What is the smallest possible value of xy? (Please show working out, thank you.)

asked by Anonymous on June 16, 2017
47. ## chemistry

How much energy is required to raise the temperature of 3 kg of lead from 15C to 20C? Use the table below and this equation: Q = mcT.

asked by bebe on October 9, 2012
48. ## Math

Write an equation to model: The temperature of hot water placed in the freezer is 80 'C and it decreases at a rate of 8' C per hour

asked by Bob on November 9, 2016
49. ## Algebra 1

Lately I just have blacked out in my algebra 1 class. Here's a equation on my worksheet, and I would be happy if you could show in steps how you got your answer. Thank you. (2x²+5x+3)-(x²+2x+1)

asked by Samantha on September 8, 2009
50. ## Math 116

Create an equation of a nonlinear function and provide one positive and one negative value for x. Please show steps in how to solve it as well.

asked by University of Phoenix on August 26, 2011
51. ## Chem

How many liters of hydrogen gas are neede to generate 90.0g of water of 25.0°C and 1 atm pressure? What is the equation I can use to figure this?

asked by Ginger on April 19, 2008
52. ## algebra 1

i know that the slop intercept form is y-y1=m(x-x1) i have to write an equation for a line that has a slope of 6 and contains the point (-8,-7) even with the formula i don't now how, HELP!!!!

asked by lisa on January 19, 2010
53. ## chemistry

1. based on the equation below, how many liters of water can be produced from 8.5 L (assume that hydrogen is in excess) 2H2(g)+O2(g) --->2H2O(g)

asked by holly on February 7, 2017
54. ## algebra

I having serious problems trying to solve this equation please help me find the product matrix for this input-output and demand matrices A= [ 0.1 0.03] D=  [ 0.07 0.6] 

asked by JC on April 26, 2014
55. ## math

The sales representative later indicates that their are three times as many homes avaiable with the second plan then the first. Write an equation that illistrates this using x and y as variables.

asked by tera on February 10, 2009
56. ## Math

Graph the linear equation. I need coordinates, but don't think they match up to my choices. I would appreciate some feed back. ThankS! 4y + 36x = -32

asked by Michelle on March 2, 2009
57. ## chem

Using the equation 2H2 + O2 ==> 2H2O, determine how many grams of water is produced when 29 moles of oxygen is consumed

asked by erika on January 24, 2017
58. ## Chemistry

Write a chemical equation for 48g of gasoeous hydrogen and 320g of gaseous oxygen yield

asked by Help on December 10, 2016
59. ## chemistry

What is the balanced molecular equation and their physical state of each substance of barium chloride and 3 M sulfuric acid?

asked by jay on November 17, 2010
60. ## Chemistry

Write the chemical equation for the standard molar enthalpy of formation of periodic acid, H5IO6.

asked by Sam on October 21, 2012
61. ## Math Calc

given the relationship 2x^2 + y^3 =10, with y > 0 and dy/dt = 3 units/min., find the value of dx/dt at the instant x = 1 unit. SUPER CONFUSED DONT GET THE EQUATION!!!!!!!

asked by Ke\$ha on January 5, 2017
62. ## MATH

I still don't know how to completely solve systems by substitution. Can someone please help me? 1. Y=-11+x 3x+10y=-6 How would you know where to plug in the right section of the equation in a certain place? 2. Y =6x-5 Y =-x+9

asked by Anonymous on January 28, 2014
63. ## Algebra

How do I solve a quadratic equation x^2 - x = 30 by completing the square- I don't understand-could someone just explain the steps to solving this

asked by Jamie on September 21, 2010
64. ## Chem

the equation is, 2KCL0subscipt3--->2KCL+3Osubscript2 if 5.0 g of KCLOsubscript3 is decomposed, what volume of 0subcript2 is produced at STP?

asked by Donald on March 5, 2009
65. ## Math

How do you write a system of linear equations in two variables? Explain this in words and by using mathematical notation in an equation.

asked by Felicia Chase on April 19, 2014
66. ## Chemistry

given the equation Mg +2HCL --> MgCL2+H2, how many moles of hydrochloric acid are needed to react with O.50 mol of magnesium ? (1)0.5 (2)1.0 (3)2.0 (4)4.0 is it 3 ?

asked by nina on January 2, 2011
67. ## Maths: Intergration

The curve with equation y = ax^2 + bx + c passes through the points P(2,6) abd Q(3,16), and has a gradient of 7 at the point P. Find the values of the constants a,b and c. Thanks!

asked by Anonymous on February 16, 2009
68. ## trignometry

Give a list of solutions, in the interval [0, 360°), in degrees, of the equation 2cos^24θ + 5 cos 4θ = 3.

asked by jojo on October 24, 2015
69. ## science

Identify the reactants and the products in the following chemical equation: Cd(NOsub3)sub2(aq)+Hsub2S(g)-->CdS(s)+2HNOsub3(aq)

asked by Anonomous on January 12, 2010
70. ## ap chemistry

i am having trouble writing the half reactions and the balanced equation for the galvanic cell Ag(s) |AgI(s) | I−(aq) || Cl−(aq) |AgCl(s) |Ag(s)

asked by brian on October 15, 2010
71. ## geometry

Find the coordinates of the center and the radius of a circle with and equation of: a. x^2 + 2root7x +7 + (Y-root 11)^2 =11 b. x^2 -12x + 84 =-y^2 + 16y

asked by lindsay on April 29, 2012
72. ## Chemistry

What is the balanced molecular equation and their physical state of each substance of silver(I) nitrate and 6 M hydrochloric acid?

asked by jay on November 17, 2010
73. ## Chemistry

How could you prove that sodium hydroxide is a base without using litmus papes to test? Give an equation for the reaction

asked by Divine on September 18, 2014
74. ## Science/Chemistry

Is this equation balanced? Does it show that no atoms are lost or gained in chemical reactions? 8Fe + S8 --->8FeS

asked by Anonymous on March 18, 2014
75. ## Maths

The sum of three consecutive numbers is 51. Find the largest number. Also write the equation to solve the problem

asked by Jannie on October 7, 2010
76. ## Calculus

Determine the equation ofthetangent line in slopeintercept form at x=1 of y^3 +2x^2=1 at x=1. Please show work so I can follow the process. Thanks!

asked by Rene on April 1, 2013
77. ## trig

Write an equation of a secant graph that has amplitude of 3, period of pi/2, is shifted to the left pi/4, and is flipped over the x - axis.

asked by Anonymous on September 24, 2010
78. ## chemistry

heat of 100g of water when transfer -10C to 150C using this equation q=¡ò_(T_2)^(T_1)¢Æc_p dT

asked by Anonymous on November 2, 2012
79. ## nuclear physics

An atom of Radium-228 transmutes to radon-222. Write the nuclear equation for this decay.... How ??

asked by Garth on May 28, 2012
80. ## Applied calculas

Let y=〖tan〗^(-1) x Rewrite it as an equation involving a trig function. Use implicit differentiation to determine an expression for y.

asked by jack on April 8, 2013
81. ## alebra

write the equation in slope-entercept form. W(-1, 2.4) and S(5, 2.4) m=2.4-(5) ______ 2.4-(-1) for the answer I get -2.6 _____ 3.4 is this right if not please show me where I got off track.

82. ## Math

y = a(x - h)2(sqaured) + k Where would I put a number in order to stretch or compress the graph vertically in the equation above? And what does the a represent?

asked by Lena on March 23, 2009
83. ## chemistry

Write a balanced equation showing the solubility equilibrium reaction of solid calcium hydroxide??

asked by Anonymous on April 11, 2012
84. ## College Algebra.

Find the equation in standard form of the hyperbola that satisfies the stated condition. Foci (0,5) and (0,-5), asymptotes y = x and y =-x

asked by Nicki on December 17, 2009
85. ## physics

A train with a velocity of 45.1 m/s must come to an emergency stop in 10.6 s. How far did it travel during this time? i tried to use the x=1/2at^2+vit+xi equation but that did not work..

asked by ash on December 17, 2009
86. ## calc

find an equation of the line tangent to the circle (x-1)^2+(y-1)^2=25 at the point (4,-3) Can please someone explain this to me and show all work very confused

asked by Alyssa on May 8, 2017
87. ## algebra

Describe the steps to graph the direct variation equation y = – 3x. In the formula d = rt, what do each of the letters stand for and how do they relate?

asked by rosiee on February 4, 2010
88. ## Math

How many solutions does the equation −2y + 2y + 3 = 3 have? (1 point) One Zero Infinitely many Three i am not sure since there isnt a variable. Reiny can you please help. I am thinking the answer is either One or Infinity Many

asked by Hi my name is boily! :) on April 19, 2019
89. ## Harrisburg Area Community College

find the equation of a rational function that passes through (0,1) and (2,1), has the x axis as a horizontal asymptote, and has two vertical asymptotes at x=3 and x=-3

asked by Alanna on October 27, 2015
90. ## math

Find three ordered pairs that satisfy the equation. (0, 1 ), ( 2 , 7), (2, 3 ).Viewing Saved Work Revert to Last Response.

asked by Anonymous on September 10, 2012

solve algebriaclly the equation y=2sin2x+1 for 0

asked by MATHS QUESTION!!!!!!!!!!!!!!!!!!!!!!!!!! on December 6, 2009
92. ## help me please math

Write the standard equation of the ellipse with the given characteristics this is due in the morning I have no ideal how to do it vertices:(-8,1)(0,1) (-4,7) (-4,5) center:(-4,1)

asked by Ajay on May 7, 2012
93. ## chemistry

write and equation for the reaction of triethylamine and water. does the eqilibrium go to the right or left. so far what I have is C6H15N + H2O but I'm not sure of the products

asked by casey on April 12, 2012
94. ## PreCalc

Find the standard form of the equation of the ellipse with the following characteristics. foci: (+/-5, 0) major axis of length: 22

asked by barb on December 2, 2010
95. ## Trigonometry

Use the half-angle identities to find all solutions on the interval [0,2pi) for the equation sin^2(x) = cos^2(x/2)

asked by Nikki on July 15, 2012
96. ## Trigonometry

Use the half-angle identities to find all solutions on the interval [0,2pi) for the equation cos^2(x) = sin^2(x/2)

asked by Nikki on July 15, 2012
97. ## PreCAL

Write an equation in slope–intercept form of the line with the given parametric equations. x = 9t + 2 y = –6t + 9 Answer Choices (A) y=-2/3x-3/7 (B) y=-3/2x+3/31 (C) y=31/3x-2/3 (D) y=-2/3x+31/3

asked by PreCAL on January 24, 2014
98. ## Algebra

Hello, I am having a bit of trouble with two Algebra questions 1. Solve x= 8x - over the domain [0, 2, 4, 6] 2. For what values of a is the equation /a/ =5 true? Thanks in advance.

asked by Tamir on December 27, 2009
99. ## CHEMISTRY

In half reaction method of the chemical equation balancing , how about those redox reactions that they don't contain any (H) and ( O ) atoms ?