# 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 111
1. ## math

how many ways can this equation be made true 24 x 18 = 432 x

asked by mom on March 29, 2011
2. ## algebra 2

What is the equation of the parabola with vertex (3, -20) and that passes through the points (7, 12)

asked by Anonymous on February 20, 2016
3. ## Math

Solve the equation by the substition method. x-y=11 3x+10y=-6?

4. ## Math

Solve the equation by the substition method. x-y=11 3x+10y=-6?

5. ## Math

The roots of the equation 4x^2+4x-5 = 0 can be written in the form x = -1+-*SqrtA/2 The value of A is, how exactly do I do this?

asked by -Untamed- on December 7, 2011
6. ## math

what would x^2+y^2-4x+2y=0 (Equation for a cirlce) be in r^2=(x-h)^2(y-k)^2 form? tnx I will start you off... x^2+y^2-4x+2y=0 x^2-4x+y^2 +2y =0 x^2-4x+ 4 + y^2 +2y+ 4 =+ 4+ 4 (x^2-4x+ 4) + (y^2 +2y+ 4) =8

asked by Luke on June 1, 2007
7. ## calculus

find an equation of the curve that satisfies dy/dx=4x^3y and whose y-intercept is 7

asked by linda on March 20, 2011
8. ## math

Which equation means three minus a number is equal to 7? A. g – 3 = 7 B. 7 – 3 = g C. 3 + g = 7 D. 3 – g = 7

asked by mia on March 27, 2017
9. ## Algebra 2 (Math)

What is the vertex form of the equation? y = -x^2 + 12x - 4. I have no clue how to do this.

asked by Riley on December 14, 2015
10. ## Algebra

Write the slope intercept for of the equation: >Through (4,-2) and (0,-4) Ans y= 1/2x -4

asked by NEED HELP - REPOST from previous on January 6, 2016
11. ## math (algebra).

Graph the equation and identify the y-intercept. y= _1_ 3 x

asked by jerome on July 2, 2009
12. ## Algebra

Write an equation of a line that is parallel to y = 3x – 5 and goes through the point (3, 1).

asked by Anonymous on January 12, 2015
13. ## Math

Solve the equation. Check for extraneous roots. 4^2x-4^x-20=0

asked by Vikki on January 11, 2015
14. ## trig

finding the period of a graph given a equation y=-5sin1/3(x-pi/2)

asked by ashley -- on April 26, 2011
15. ## math

factoring to solve quadratic equation 5x^2=16x+45

asked by lori on April 26, 2011
16. ## Math

a+b+c=28 b= a+3 I plugged in the b but got stuck on 2a+3+c. What I did: a+a+3+c=28 2a+3+c=28, but what do I do next to solver this linear equation?

asked by Rabie on January 12, 2016
17. ## maths

find the equation of the tangent to the curve y=4x^2+5 at the point (2,21).

asked by AA4 on January 4, 2015
18. ## Math

(Find the slope and y intercept of the graph of each equation) 2y + 4n = -6x

asked by lol on January 1, 2015
19. ## Algebra

How do I create a quadratic equation that passes through the points (-1,2),(1,7),(4,5)?

asked by MV on November 20, 2011
20. ## Algebra

If (3,-5) is a point on the graph for the equation in the form y=mx+7, then m=? Answer: -5=m(3)=7 m=-4

asked by need help on January 5, 2016
21. ## algebra

How do I solve a linear equation using equality properties?

asked by mom on November 14, 2011
22. ## Algebra

Find the equation of a line throught the points P (-1, 6) and S (4, 2)

asked by William on December 18, 2007
23. ## AP chemistry

what is the balanced equation of H+ + [Al(OH4]- and [Al(H2O)6]3+ + K+ + SO4

asked by Lilly on October 15, 2009
24. ## Math - Algebra

[ (x-3)(x+1) / (3x+11) ] = 0 How would I solve this equation? I don't know how to isolate for x. Answer: 7

asked by Anonymous on December 12, 2007
25. ## algebra

Solve each equation. Watch for extraneous solutions 5/y-3 = y+7/2y-6 +1

asked by Joe on July 13, 2009
26. ## calculus

Find an equation of the tangent line to the curve at (8,0). y=ln(x^2 -8x +1)

asked by Alexa on November 9, 2011
27. ## math

repost find unknown number in the equation 9/10 - x = 1/5

asked by bob on January 21, 2015
28. ## Chemistry

How do I find x and y in the following equation: 222. 4 86 Rn - 2 He + X 228. 0 -1 e. + y 88ra

asked by Victoria on January 17, 2015
29. ## Algebra

Simplify this equation: -9-6(w+5) I think it is -15w+30. Please reply ASAP

asked by Me on January 15, 2015
30. ## Algebra 1

asked by Anonymous on December 23, 2015
31. ## math

What is the equation of the chord of the circle x^2+y^2=16, passing through (2,3). Pls help!

asked by manish on December 25, 2015
32. ## math

What is the equation of the chord of the circle x^2+y^2=16, passing through (2,3). Pls help!

asked by ranju on December 25, 2015
33. ## math

use the distributive property to help you solve the equation 9(w-2)=45 w=7 is this correct?

asked by jason on June 29, 2009
34. ## Algebra

Write an equation of the line with a y-intercept of -4 that is parallel to 6x-2y=13

35. ## math

Hints to solve following nonlinear equation please? y=-4.9x^2+20x+10 9.8x+y=20

asked by momo on November 21, 2011
36. ## math

Please explain the steps on to solve this equation. x^-6 - 8x^-3 + 16 = 0 k^-4/3 - 10k^-2/3 + 21 = 0

asked by Hellga on January 9, 2008
37. ## chemistry

How do you balance the equation NH3 + CuO > Cu + H2O + N2

asked by Trish on April 15, 2011
38. ## Algebra

(write equation in simplest form) -6q+5.8=23.8 A.q=3 B.q=-3 C.q=-1.83 D.q=4.93 My and we was C. Is that correct?

asked by Amber on January 21, 2016
39. ## Math

how do i find the equation of a parabola given x intercepts x=0 and x=6 and a vertex at (3,4)?

asked by Cody on November 25, 2011
40. ## MATH

CAN YOU EXPLAIN TO ME HOW quadratic equation CAN BE USED IN EVERYDAY LIFE?

asked by patiance on April 14, 2011
41. ## maths

solve the equation x³ − 7x² + 36 = 0 , given that one root is double the other

asked by tabassum on January 22, 2016
42. ## math

find the equation of tangent to the curve (x\a)^n + (y\b)^n = 2 at the point (a, b)

asked by moh on December 16, 2014
43. ## Math

solve the equation sin(3x) + (1/2) = 2cos^2(x) for X to be between 0 and 360

asked by sahmit on April 14, 2011
44. ## precalulas

solve each equation over the given interval 2x=cosx for all values of x

asked by sylvia on November 27, 2011
45. ## math

The product of 8 and twice a number is 3. What would that translate to if you were to write it out as an equation?

asked by johnny on October 22, 2009
46. ## Math

What is the equation of the line that has a slope of 0 and passes through the point (6, -8) A. x=6 B. y=6 C. x=-8 D. y=-8

asked by Anonymous on December 18, 2014
47. ## finitie math

solve the system of equation for all variables using a matrix 2x+y+z=6 -3x-4y+2z=4 x=y-z=-2

asked by crystal on June 26, 2009
48. ## finite math

solve the system of equation for all variables using a matix x-y-z=1 2x-3y+z=10 x+y-2z=0

asked by crystal on June 26, 2009
49. ## Math

How do I create a quadratic equation that passes through the points (-1,2),(1,7),(4,5)?

asked by momo on November 21, 2011

If Y varies inversely as X^2, determine what Y would be if X = 2 and another point on the equation is (1,8).

asked by ki on April 18, 2011
51. ## Pre-Calculus

How do you solve the equation(800+x)tan33=xtan35?

asked by Angie on December 29, 2014
52. ## Math

For what values of r does the function y = erx Satisfy the equation y'' + 5y' + 6y = 0?

asked by Mathematics on January 16, 2016
53. ## Math

(Find the slope and y-intercept of the graph of each equation) y = 5x – 3

asked by lol on December 26, 2014
54. ## Math

Solve the logarithmic equation for x. Log3(x^2 − 5x − 9) = 3 I Have no idea

asked by Anonymous on November 22, 2011
55. ## arithmetic

using 1,2,6,7 and arithmetical symbols make equation to get 33 as answer

56. ## Math

Write a quadratic equation having the given number as solutions -7 and -4 I cant think of how to do this?

asked by Allison A on November 22, 2011
57. ## math

what is the difference between ( and [ in context to solving algebric equation?

asked by Ted Mosbi on June 27, 2009
58. ## Calculus

Determine the equation of the normal line y=x^2+5 at the point (2, 9) I got y= 4x+1

asked by Olivia on December 21, 2014
59. ## Chemistry

What is the equation for the reaction between stearic acid and ammonia?

asked by Anonymous on January 22, 2016
60. ## CHEM 111

What is the net ionic equation of Na3PO4 + NH4Cl=?

asked by Anonymous on October 8, 2014
61. ## Algebra

What are the solutions of the quadratic equation below? 4x2 - 30x + 45 = 0

asked by Jay on February 17, 2011
62. ## maths(algebra)

can u plz solve ma algebric equation: 3x-4/2=3(x-3)-2 i shall be very thankful to you

asked by qasim on February 17, 2011
63. ## Math

An equation of the line whose slope is 3 and whose y-intercept is 8 is ___?

asked by Tyrone on February 19, 2008
64. ## math

given the linear equation y = -2/3x -2. find y coordinates of the points (-9) (-3) and (6)

asked by candie on February 16, 2011
65. ## Geometry

What is the equation of the circle with center (-4,-3) that passes through the point (6,2)? (x-4)2+(y-2)2=9 (x-3)2+(y+2)2=9 (x-3)2+(y+2)2=3 (x+3)2+(y-2)2=3

asked by JCancer on May 16, 2016
66. ## Algebra

What is an equation of the line that is parallel to y= 3x + 1 and passes through the point (2,6) Is it Y=3x + 6

asked by Keishia on February 19, 2008
67. ## MATH

find the equation of the line that passes through the points (0,3) and (-3,7).

asked by Amanda on May 11, 2009
68. ## pre algebra

solve equation.. i continually keep getting this problem wrong x/3=x/5-2

asked by jerson on November 15, 2009
69. ## geometry

solve for x. 8x/10x-2 = 5x+3/7x i don't know how to get the x squares out of the equation!

asked by dccs on February 15, 2011
70. ## Solid mensuration

Find an equation of the circle tangent to x + y = 3 at (2,1) and with center on 3x - 2y - 6 = 0

asked by Jane on January 30, 2012
71. ## Math, Algebra

81^3(x+1)=9^2(x-1) Solve this equation by expressing both sides as powers of 3.

asked by Anonymous on May 12, 2016
72. ## Math, Algebra

81^3(x+1) = 9^2(x-1) Solve this equation by expressing both sides as powers of 9.

asked by Anonymous on May 12, 2016
73. ## Math, Algebra

81^3(x+1)=9^2(x-1) Solve this equation by expressing both sides as powers of 3.

asked by Anonymous on May 12, 2016
74. ## Calculus

An equation of the line with slope -1 that passes through the point (2,5) is y=-x+7

asked by Ryan on April 24, 2016
75. ## college

First write the value that makes the denominator zero then solve the equation x-8/2x+5=x+6/x

asked by Cherry on November 11, 2009
76. ## Math

by completing the​ square, what value should you add to each side of the​ equation? x^2- 7x=5

asked by Kelly on April 24, 2016
77. ## Math

What is an equation of the line that passes through the points (3,-3) and (-3,-3)? how do you figure this out: a. y=3 b. x=-3 c. y=-3 d. x=y

asked by Angie on May 16, 2009
78. ## NH4NO3 explosive?

How is NH4NO3 explosive? Please explain with chemical equation. Thank you so much!

asked by Drew on October 6, 2014

If you are looking at a graph of a quadrtic equation, how do you determine where the solutions are?

asked by Marysvoice on February 16, 2008
80. ## Calculus

Find the equation of the tangent line to the curve 2e^(xy) = x + y at (0,2)

asked by Matt on May 14, 2009
81. ## Pre-Algebra

Can someone show me how to turn this into an equation? I mean like 'y=x-z' -2x+ y > or equal to 2 Did I say what I needed to get right? -MC

asked by mysterychicken on May 14, 2009
82. ## Algebra

Write the equation in standard form. (2,8) m=9 What are the steps to do this?

asked by Niki on January 25, 2012
83. ## algebra 2

Solve each system of equation by grpahing? 3. y=-3x+6 2y=10x-36 4. y=-x-9 3y=5x+5

asked by anonymous on September 27, 2014

If P(400)=900 Rewrite this Equation in terms of p^-1

asked by Steve on February 15, 2011
85. ## math

HELP me find the angles from the following equation (4cotx+3)(cotx-1) = 0

asked by beracah on May 21, 2016
86. ## Math(I Truly Need Help Please)

If P(400)=900 Rewrite this Equation in terms of p^-1

asked by Steve on February 15, 2011
87. ## math

Write an equation of the line passing through (-5,-14) and (4,0.4) in form of Ax+By= C

asked by Duran on June 1, 2016
88. ## Alg2

Solve the equation -5e^-x + 9 = 6 I subtracted 9 to both sides and got: -5e^-x= -3 < this is where I'm stuck at.

asked by Yolie on February 2, 2012
89. ## calculus

Find the equation of the line given that f(x)=10^x and the point A is at x=log10(5).

asked by caleb on February 2, 2012
90. ## algebra

y varies inversely with x, and y = 10 when x = 2. What is the equation for the inverse variation?

asked by james on June 3, 2016
91. ## science

What is a balanced chemical equation for the combustion of cooper?

asked by kuhle ngcezu on June 5, 2016
92. ## Calculus

the equation represents for a recurrence relation, Mt+1= 0.75Mt+2 with Mo=5

asked by Anonymous on February 8, 2011
93. ## Calculus

Find the equation of the line tangent to the graph of f at (1,1) where f is given by f(x)=2x^3-2x^2+1

asked by Grace on February 8, 2011
94. ## match

the sum of two times a number and 5 is 11? equation form.

asked by jay on February 8, 2011
95. ## Science

What is the equation of the street line that passes through the points 1 and -4 and 3 and 2

asked by Anonymous on June 7, 2016
96. ## Alg 2

Solve the equation. Check for extraneous solutions. ln x + ln(x-2) = 1

asked by Yolie on February 2, 2012
97. ## Algebra

How do I solve this equation? 1+1/x over x over 1/x-1 By the way this is a Complex Rational Expression.

asked by Anonymous on May 31, 2016
98. ## Science

__ NH4NO3 (s) --> __ NH2 (g) + __ HNO3 (l) Please balance equation!

asked by Ronaldo on February 10, 2011
99. ## Math

Solve the equation e^x-10=10. Do I have to change it to log form? What do I do after that?

asked by Cheezel on May 30, 2016
100. ## math

given the linear equation y = -2/3x -2. find y coordinates of the points (-9) (-3) and (6)

asked by shantrese on February 14, 2011