# 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 107
1. ## Chemistry

Would the molecular ratio of the equation 4Na + O2 = 2Na2O be 4:2?

asked by Beth on November 11, 2010
2. ## linear equations

Having trouble with this one. Thank you. Graph the equation and identify the y - intercept. y = 4/3x+2. (0,?) Thank you

asked by Jessica on November 11, 2010

Find the equation of the hyperbola whose vertices are at (-1,-5) and (-1,1) with a focus at (-1,-7). Please and thank you.

asked by TJ on April 21, 2012
4. ## ALGEBRA

GRAPH THE EQUATION AND IDENTIFY Y INTERCEPT. y = x + 3; I tried this one can you tell me if I'm correct?? Let x = 0, then y = 3; (0,3) Let y =0, then x = -3 (-3,0) THANK YOU!

asked by Amy on November 11, 2010
5. ## Math 8R - HELP!

asked by Laruen on January 29, 2013
6. ## Maths

Analyse the following equation using rotational axis 4x^2 + 9y^2 - 8x + 36y + 4 = 0

asked by Kennedy on December 17, 2016
7. ## math

How do you solve an equation with trinomials and polynomials equal to zero?

asked by Primrose on March 12, 2014
8. ## Algebra 2

√3x-4=2√x-5 Solve this equation, if there is more then one answer separate with a comma

asked by Nancy on April 18, 2012
9. ## Algebra 2

√3x-4=2√x-5 Solve this equation, if there is more then one answer separate with a comma

asked by Nancy on April 19, 2012
10. ## Pre Calculus

Write the rectangular equation in polar form... x=3

asked by Alexis on March 13, 2014
11. ## Calculus

find the equation of a tangent line of x^(1/4) + y^(1/4) = 4 at the point (16,16)

asked by kevin on November 14, 2010
12. ## Algebra 2

Find the equation of the line parallel to y=2x+6 and passing through (4,5)

asked by Anonymous on February 25, 2019
13. ## Algebra 2

find the equation of the line with a slope of 4 and passing through (0 3)

asked by Anonymous on February 25, 2019
14. ## math

determine the equation of the graph in the form y=acos(bx)

asked by Anonymous on December 14, 2016
15. ## Calculus Tangent lines

find the equation of a tangent line of x^(1/4) + y^(1/4) = 4 at the point (16,16)

asked by kevin on November 14, 2010
16. ## Algebra

How can I rewrite an equation and graph it if it’s negative? For example; 12x- 4y=24

asked by 😍 on February 13, 2019
17. ## Chemistry

How do you balance the equation? MnO4^-1(aq) + C2O4^-2(aq)-> Mn^+2(aq) + CO2(g)

asked by Cris on November 14, 2012
18. ## Math

use the inverse operation to solve below equation. 19= h/3-8 equals 81 Thanks

asked by Jamie on October 29, 2017
19. ## Math

Explain how you can use mental math to solve the equation 8^(x-4)=1.

asked by Kim on March 14, 2018
20. ## maths

solve the equation express the answers in p and q x(square) - (p+q)x + (p+1)(q-1)=0 Then x=? or x=?

21. ## Math

Find the equation of a line that is perpendicular to 3x-2y=6 and passes through (1,2)

asked by Crystal on February 22, 2010
22. ## math

6x-4y=8 have to find the slope for that equation, and the y-intercept, so I'll start with x=0

asked by Stephanie on July 12, 2010
23. ## calculus

f(x)=(x^2+1)(1-x-x^3).Determine the equation of the line tangent to f(x) at the point (1,-2).

asked by jump on September 30, 2012
24. ## Algebra

help me solve this equation by substitution. y^2− 4x^2 = 7 9y^2+16x^2 = 323

asked by Tom on November 9, 2012
25. ## math

Solve each equation by factoring v(squared) - 10v + 21 = 0

asked by Help on August 7, 2013
26. ## geometry

determine the center of the circle whose equation is x^2+y^2+8x-12y+34?

asked by Anonymous on March 15, 2018
27. ## Pre-algebra

How do you write an equation to determine possible values for a perimeter =52

asked by Aaron on September 27, 2012
28. ## math

Find the equation of the line tangent to f(x)=3x^2-2x-1 at the point where x=2

asked by gerald on August 1, 2013
29. ## ALGEBRA I

Which equation is represents the line that passes through the points (6,-3) and (-4,-9)? a. y+4 =3/5(x+9) b. y+4=5/3(x+9) c. y-3= 3/5(x+6)****** d. y+3=3/5 (x-6)

asked by SAM on October 25, 2017
30. ## Calculus

Find an equation of the tangent line to the curve for the given value of t. x=t^2-2t, y=t^2+2t when t=1

asked by James on November 13, 2012
31. ## math,algebra

what error am i doing here? can someone explain to me. The equation: 2(x – 2) = x + 3 First step in solving:

asked by jasmine20 on December 19, 2006
32. ## Algebra 1 (Reiny or Kuai)

Determine a relationship between x- and y-values. Write an equation. {(1, -1), ( 2, -2), (3, -3), (4, -4)

asked by Anonymous on November 4, 2013

how do I write an equation for "fifteen decreased by twice n equals 13"

asked by karen on November 13, 2012
34. ## chemistry

Na3PO4(aq) and AgNO3(aq). Write the ionic equation.

asked by melinda on November 4, 2013
35. ## principles of algebra

Translate to an equation: r \$2 roses and t \$2.50 tulips total \$30

asked by zuly on September 26, 2012
36. ## math

how do I write the equation for fifteen decreased by twice n equals 13?

asked by karen on November 12, 2012
37. ## Algebra 1

Find the x-intercept of the graph of the equation. 9x-4y=10 Is the answer: 10/9

asked by Mary on October 29, 2013
38. ## maths

prove that if m is not equal to n, the equation (m^2+n^2)x^2 - 2(m+n)x + 2=0 has unreal roots.

39. ## Math

How would you differentiate this equation? 1/6(2x-3)^3 -4x Here's my working u = 2x-3 y = 1/6u^3 dy/du = 1/2u^2 du/dx = 2 dy/dx = dy/du x du/dx = (2x-3)^2 -4 Is this correct? Thanks for checking!

asked by Autumn on November 9, 2017
40. ## John

asked by Daniel on November 11, 2017
41. ## Chemistry

How would you balance this equation: CuS + KCl = ? Can you explain.

asked by Mary on January 28, 2009

If I were looking at a graph of a quadratic equation, how do I determine where the solutions are?

asked by Lynn on September 2, 2010
43. ## Calculus III

Find an equation of the plane passing through the three points given. P=(5,1,1) Q=(1,1,2) R=(2,1,1)

asked by Calvin on September 2, 2010
44. ## math

please help me how to solve cubic equation : h^3 - 36h^2 + 2356.6 = 0 thanks..

asked by anet on October 25, 2013
45. ## Math help

Solve this equation and check answer Fraction→n/56=8

asked by Nina on October 24, 2013
46. ## Math

What value of b makes the equation below true? b+1/4=12/12 Please show work Thanks

asked by Jennifer on November 7, 2012
47. ## math

describe the picture you would get by graphing the solutions(if there are any!) to the equation (x+y)^2=x^2+y^2

asked by dan on October 3, 2012
48. ## math

write as an equation- seven more than twenty less one half of six is thirty four

asked by olivia on February 11, 2010
49. ## algebra math 208

write each equation in slope-intercept form y+3= -3(x - 6)

asked by anita on July 15, 2010
50. ## Math

For the equation -4y=8x, what is the constant of variation? A -4 B -2 C 1 D 2* Can some one check my work?

asked by Blaw on November 6, 2017
51. ## math

Find an equation for a line that contains (-4, -3) and is parallel to the graph of 2x - 5y = 40 1. y = -2/5 x + 4 3/5 2. y = 2/5 x - 1 2/5 3. y = -5/2x - 13 4. y = 5/2x + 7

asked by Shiv on March 12, 2018
52. ## math

Find interval length 1/4 in [1,2] containing the root of the equation x^7 +3x-10=0

asked by lola on October 2, 2012
53. ## math

If given a set of functions, how do you write an equation for them? For example: x: 1,2,3,4,5 y:5,10,15,20,25. I am confused.

asked by courtney on February 10, 2010
54. ## Chemistry

Write an equation that explains the conductivity of NH3

asked by Jackson on February 10, 2010
55. ## math 208

write each equation in slope-intercept form. y+3=-3(x-6)

asked by anita on July 15, 2010
56. ## Math

What value of b makes the equation below true? b+1/4=12/12 Please show work Thanks

asked by Jennifer on November 7, 2012
57. ## Math help

Solve this equation and check answer Fraction→n/56=8

asked by Nina on October 27, 2013
58. ## Pre Clac

Determine k and solve the equation: x^3-kx^2+3x+54=0, if one of it zeros is triple of another.

asked by Katie S on September 1, 2010
59. ## Algreba

asked by Monica on October 25, 2017
60. ## MAth

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

asked by dawn on August 1, 2008
61. ## algebra

how to graph point-plotting method this equation? x=y^2 + 2

asked by wanda on September 17, 2012
62. ## chemistry

The equation Mg(s) 2HCl(aq)---MgCl2 (aq) H2(g) is an example of which type of reaction?

asked by natasha on July 29, 2008
63. ## Math

Write an equation of the line that passes through the points (-8, -1) and (-5, 9).

asked by Neil on September 17, 2012
64. ## math

y=3.0,2.2,1.9,1.6,1.4,1.2,1.1,1.0,0.88,0.83 x= 2,3,4,5,6,7,8,9,10,11 how do you find the equation curve of best fit with these numbers

asked by Unknown Girl on November 19, 2012
65. ## chemistry

symbol used in a chemical equation to indicate the phrase with react with?

asked by kate on February 3, 2009
66. ## Math

Is the equation true, false, or open? 9p+8=10p+7

asked by Anonymous on October 6, 2017
67. ## CALCULUS

AN EQUATION OF THE LINE NORMAL TO THE GRAPH OF Y= SQRT[3X^2 + 2X] AT (2, 4) IS??

asked by JIM on January 2, 2009
68. ## geometric series

what is the nth term equation for a geometric sequence with a1 = 36 and r = 1/3

asked by raven on September 13, 2010
69. ## math

rewrite the equation so that y is a function of x.then use the result to find y when x= -2,-1,0,1 6x-2y=10

asked by brittney on November 19, 2012
70. ## math

rewrite the equation so that y is a function of x.then use the result to find y when x= -2,-1,0,1 -6x-1=-4y+2

asked by brittney on November 19, 2012
71. ## Math help

Find the equation of the line containing the following pair of points (-1,-7)(-4,-9)

asked by tera on February 4, 2009
72. ## MATH

Use a property of rational exponent to simplify this equation (C^6) ^7

asked by Anonymous on September 29, 2017
73. ## algebra

Solve the following equation for p: 5s - 3p = fp + 12 the fp is confusing me so much, I've tried solving it so many times but this keeps getting me

asked by Kelley on September 30, 2017
74. ## algebra

wat is the answer to the following equation by using the substitution method? x=6y-4 x=-2+28

asked by ki ki on July 2, 2010
75. ## trig

2sin(3x-3.14)-1 find the inverse form of this equation

asked by bob on February 8, 2010
76. ## calculus

Find an equation of the tangent to the curve f(x) = 2x^2 - 2x + 1 that has slope 2.

asked by theophilus on July 4, 2010
77. ## math

Solve each equation by testing the given values for a variable y-9=11 y=18, 19, or 20

asked by Gio on November 20, 2012
78. ## pre-algebra

find the two ordered pairs that you can use to graph the equation y=-1/3x-2

asked by krystle on November 11, 2013
79. ## math

rewrite the equation so that y is a function of x.then use the result to find y when x= -2,-1,0,1 -2y-3x-16=0

asked by brittney on November 19, 2012
80. ## Algebra equation

Any advice on this one would be appreciated I have the equation x+3-1/x=0 and I have an answer of x = 0.30 (to 2 d.p.), I just need to know the steps to get there, Many thanks

asked by Nev on July 8, 2010
81. ## Math

Solve for B: A=1/2(b+B) h show work. I am struggling with the above equation can someone please help? Thanks

asked by A on November 10, 2013
82. ## HELP ! Algebra

Solve the quadratic equation by completing the square. (-x^2 + 6x + 10 = 0)

asked by Robert on November 16, 2012
83. ## math

use the quadratic formula to solve the equation: x^2+10x-10=0

asked by key on January 4, 2009
84. ## Math

How do you write this equation in standard form? F=-0.04m+12

asked by Anonymous on November 7, 2013
85. ## Alg 2 (HS)

If Y varies inversely as 3X^2, determine what Y would be if X = 4 and another point on the equation is (2, 48).

asked by Gregory B. on September 22, 2012
86. ## math

solve my system of equation with full steps 3x+4y=29 2x–5y=-19

asked by kate on July 24, 2013
87. ## math

Find an equation of the line containing the given pair of points. (1,5) and (3,6) y =

asked by SchuRonda on September 10, 2010

How to write an equation: Forty percent of a number,y, is 48.

asked by agnes on January 4, 2009
89. ## Math

What is the slope of the line represented by the equation y = 4? 0 4 -4 Undefined *I think it's 0?Is it? It is zero. (4-0.4)/4= (4-0.4)/4=

asked by Francheska on November 7, 2006
90. ## Math

Write a comparison sentence yo represent this equation. 6×7=42

asked by Mia on October 12, 2017
91. ## math

2x^2 + 5x - 8 = 0 Solve the quadratic equation by completing the square.

asked by Jack on September 20, 2012
92. ## math

2x^2 + 5x - 8 = 0 Solve the quadratic equation by completing the square.

asked by Jack on September 20, 2012
93. ## Algebra 1

I need help with this problem. Write an equivalent equation by solving for y: 5x-6y=12

asked by Marisa on October 8, 2017
94. ## Linear Equations in Two Variables

Find four solutions for each question and graph the equation. y=2x-3

asked by Celest on July 23, 2013
95. ## math

Write a quadratic equation having the given number as solutions: c/2 and d/2

asked by julissa on February 3, 2009
96. ## Algebra 1 (Reiny or Kuai)

Is the linear equation 3x - 2 = y in standard form? Explain.

asked by Anonymous on November 8, 2013

Write the equation of the lines.....best answer will be chosen 1. (3,-6) 7y+4y=5 2.(4,7) 7x+y=6 3.(-8,8) 5x=7y+6 4.(3,8) x+9y=2

asked by Michelle on July 9, 2010
98. ## Algebra 1 (Reiny or Kuai)

Is the linear equation 3x - 2 = y in standard form? Explain.

asked by Anonymous on November 8, 2013
99. ## Algebra

Find an equation of the line passing through the points (2,3) and (6,-3)

asked by James on October 11, 2017
100. ## math

Find the smallest value of x that satisfies the equation. absolute value of (x+5) = 3

asked by anynomous on September 12, 2010