# 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 136
1. ## Calculus

find the equation of both the tangent lines to the ellipse x^2+9y^2=81 that pass through the point (27,3)

asked by kelly on October 2, 2008
2. ## Algebra 1

Use any method to solve the equation. If necessary, round to the nearest hundredth. 11x2 = 8

asked by BigSlime on December 10, 2018
3. ## math

What is the value to x in this equation 6X5x= The capital x is the multiply sign the lowercase is the value i need to find

asked by Anonymous on January 6, 2019
4. ## Cactus middle school

How do I get the equation of a word problem that needs the average number of miles per gallon

asked by Carissa on August 5, 2015
5. ## MATH HELP

Write the equation of the line that passes through the points (3, 6) and (4, 10) using function notation. f(x) = 4x − 6 f(x) = x + 4 y = x + 4 y = 4x − 6

asked by Oscar on October 28, 2015
6. ## Math

Convert the equation to polar form. 8x=8y So far, I got this: 8*rcosθ = 8*rsinθ But it's wrong.

asked by Jim on March 25, 2019
7. ## Math

Given the function f(x)=2x^2 - 4x What is the orientation, vertex, axis of symmetry equation, and x & y intercepts.

asked by Keisha on October 14, 2008
8. ## Pre calculus

use a calculator to find approximate solutions of the equation. 7.63x^2+2.79x=5.32

asked by Carol on September 27, 2009
9. ## Math-Calculus

Question Details: Suppose f(3)=2, f '(3)=1/2, and f '(x)> 0 and f "(x) < 0 for all x. (a) Sketch a possible graph of f (b) how many solutions does the equation f(x)=0 have? Why? (c) Is it possible that f '(2) = 1/3? Why?

asked by Anonymous on October 1, 2008
10. ## algebra

Write the equation of the line that passes through the points (1, 7) and (5, 15) using function notation.   y = 2x + 5 y = 4x + 8 f(x) = 2x + 5 f(x) = 4x + 8

asked by Gaby on October 30, 2015
11. ## College Algebra

1 - 1 = 1 ______________________________________ 4x-12 2x-6 x^2-3x Solve the equation (its subtracting the first two fractions and equalling the last fraction)

asked by Tim on September 29, 2015
12. ## Algebra

use factoring to solve the equation 4x²-23x=6 I think the answer is x=-1/4,x=6 Just want to make sure that's right

asked by HELP on July 3, 2011
13. ## statistics

The following linear equation ,y= b0 = b1x, is a regression line with y-intercept b0 and slope b1.

asked by jessica on May 19, 2011
14. ## Algebra

Equation: 2x/5-x/3=5 (2x/5 and x/3 is a fraction) I know that you are suppose to combine like terms, like x, but don't know what I need to do, since they are fractions. Help please.

asked by Carrie on April 17, 2010
15. ## grenoble

using the hasselbach-Handerson equation calculate the fraction of asprin Pka is 5.6 and PH is 8.6?

asked by jaji on June 20, 2011
16. ## math

What is the major axis and the domain of the equation 9x^2 + 16y^2 - 36x + 96y + 36 = 0 ?

asked by dcw on March 26, 2010
17. ## chemistry

help balance this redox equation: HNO3 + Zn(s) NO(s) + ZnO ...i know i need H2O and possibly H+

asked by omar on April 11, 2010
18. ## Math

For questions 1 and 2, use integer values of x from –3 to 3 to graph the equation. 1. y = –2x2 + 3 (1 point)

asked by Katter on April 20, 2013
19. ## algebra

Use the quadratic formula to find the roots of the equation. Round to tenths if necessary. 3x^2 - 4x - 8 = 0

asked by tracy on October 20, 2011

use trigonometric identities to transform one side of the equation into the other. cos Q sec Q = 1

asked by Abbey on March 22, 2010
21. ## Chemistry

If 4.0 g of hydrogen and 10.0 g of oxygen are mixed according to the equation 2 H2 + O2 = 2 H2O, which is the limiting reagent?

asked by HElp on October 20, 2011

how do you write an equation for the number of gallons in 128 fluid ounces?

asked by Sophia on September 5, 2008
23. ## math

Find the number of solutions to the equation 2x + 5y = 2005, where x and y are positive integers

asked by m on July 19, 2009
24. ## Precalc

How would you simplify this polar equation to r=? 2=rcos(theta-20) Would i divide the 2 by both sides?

asked by Sara on August 21, 2011
25. ## Trig

How do you find an equation of a line perpendicular to y=x at the point (5,5) in standard form?

asked by ali on September 7, 2008
26. ## algebra

Which quadrants does the line representing the equation y = 8x pass through? Check all that apply.

asked by Chico on June 27, 2011
27. ## math

3 5 7 18 3=14? insert addition, subtraction, multiplication, and division to complete equation

asked by Ranch on September 6, 2007
28. ## Calculus

Find the arc length of the curve described by the parametric equation over the given interval: x=t^(2) + 1 y=2t - 3 0

asked by Liz on April 16, 2013
29. ## algebra

Find the equation for the line parallel to 2x+y=6 and passing through (2, 6). Justify your response.

asked by Michelle on March 23, 2010
30. ## math

find an equation of the tangent line to the curve at the given point: y=sqrt(1+x^3), (2,3)

asked by robert on November 1, 2011
31. ## Math

How do you solve a equation adding or subtracting negative and postive numbers??

asked by Bob on September 16, 2009
32. ## algebra

Find the equation for the line parallel to 2x+y=6 and passing through (2, 6). Justify your response.

asked by Michelle on March 23, 2010
33. ## Pre calc

Write the equation in standard parabola form? x^2+ 4xy +4y^2 +5root5 y+ 5 = 0 Thanks so much!

asked by Rebekah on May 6, 2013
34. ## Maths

Find the equation of a parabola with vertex(4,9)and y-intercept(0,-7?) Can working out please be provided?

asked by Parabola Mama on September 15, 2011
35. ## Calc BC

Let f be the function defined by f(x)=(4x-8)/(x^2+5x-14) write an equation of the lien normal to the graph of f at x=1 how?

asked by Lynn on May 3, 2013
36. ## trig

Find the solutions to the equation cos2x=sinx and 2cos^2x-3cosx-3=0

asked by Jill on May 24, 2011

solve each equation for y. do x and y vary directly? if so indentify the constant of variation. 1.4x=5y 2.2x+3y=6

asked by erik on October 20, 2008
38. ## Pre-Calculus HELP!

change the polar equation r=5/1+cos(theta) to rectangular form. How do I do this? Thank you! :)

asked by Ellie on September 6, 2015
39. ## Calculus

Find the equation of the tangent line to the curve at the given value of t: x=sin(t); y=(cos(t))^2; t=(pi/3)

asked by Laura on April 16, 2013

Identify the equation of a parabola whose focus is at (5,-1) and whose directrix is x=3. vertex=(-5,-1) p=-6 4p=-24 (x-5)=(-24)(y+1)^2 I got it wrong

asked by Jon on August 6, 2009
41. ## Math

The amount 116 is 145% of what number? (Write the equation and solve it)

asked by Anonymous on September 10, 2009
42. ## calculus

Find the equation of the line that is tangent to the graph of: x^2cosy +5y^2=(1/4)x^2 , at the point (2π,π)

asked by Rudy on October 15, 2011
43. ## Chemistry

What is the ionic equation for (NH4)2CO3=2NH3+CO2+H2O

asked by Kerry on February 21, 2013
44. ## Algebra

Which equation represents the axis of symmetry of the function y = –2x² + 4x –6? (1 point) y = 1 x = 1 x = 3 x = –3

asked by Minnie on February 21, 2013
45. ## Pre calc

Write the equation in standard parabola form? x^2+ 4xy +4y^2 +5root5 y+ 5 = 0

asked by Rebekah on May 5, 2013
46. ## Math - Vector Geometry

what is the cartesian equation of the parametric equations x=2sin(2t) and y=4cos(2t) need help badly!!!!!!!

asked by Will on September 7, 2008
47. ## geometery

If circle A has equation (x+2)^2+(y+2)^2=4, which point is in its exterior? The radius is 2, so any x or y greater than two from the center (-2,-2) will be outside

asked by aj on July 8, 2007
48. ## physics Again

bobpursley can you please check my reply to your post about my question? I am not sure if I did my equation correctly. Thanks

asked by Haley on September 12, 2007
49. ## Calculus

If the price at which x units can be sold is given by the equation p=15-4 ln x, approximate the marginal revenue when x=7.

asked by Mea on June 27, 2011
50. ## math

solve for linear equation 2x + 3y = 6 (for x) i figured out the answer. thanks for your time though : ) x = (6-3y) ________ 2

asked by karla on July 7, 2007
51. ## Math

If a trend line has equation y=4x-5, what y- value would you expect to obtain when the x- value is 5? this is kind of tricky

asked by jacqueline on September 14, 2015
52. ## Math

Identify the equation of a parabola whose focus is at (5,-1) and whose directrix is x=3. vertex=(-5,-1) p=-6 4p=-24 (x-5)=(-24)(y+1)^2 I got it wrong

asked by Jon on August 6, 2009
53. ## calculus

find tangent line equation to the curve at the given point: y= 7e^x cos(x) P=(0,7)

asked by Mare on June 27, 2011
54. ## algebra

Find the equation of a horizontal line that goes through the point (5, -3). Explain your answer

asked by joe on May 12, 2015
55. ## Algebra

What would be the first step to solving each equation, Add 4, Subtract 4, Multiply by 4, or Divided by 4? 1. 4 + 4n = -12 2. 4n = -12 3. n/4 = -12 4. n/4 - 4 = -12

asked by Remi on November 29, 2015
56. ## calculus

Given the function: y = 2 - x - x^3 use limits to find the slope (and then the equation) of the tangent line at x =2.

asked by Alex on September 25, 2008
57. ## algebra

write the slope-intercept equation for the line that passes through (-8,-11) and is perpendicular to -2x-7y=-14

asked by babygirl on August 28, 2011
58. ## Algebra II

Write an equation for the following transformation of y = x: a vertical compression by a factor of 1/2. Options: y = -1/2x y = 1/2x y = 2x y = -2x Please help me :)

asked by Katarina on November 7, 2015
59. ## Algebra

Find the vertex and the axis of symmetry for the parabola with the given equation y=5x2-30+47....

asked by Gwendolyn on September 17, 2011
60. ## MATH

Solve the equation algebraically for x where 0

asked by Anonymous on September 3, 2009
61. ## algebra

Find the exact solutions to the quadratic equation in the complex numbers. (x-13)²=-36

asked by Kevin Smith on July 1, 2011
62. ## math

how do i write the slope-intercept form of the equation of the line through the given points??? through (0,-1) and (-5,-3)??

asked by Rebecca on October 2, 2011
63. ## ALGEBRA

can someone help me? write an equation of the line satisfying the given conditions. Slope = 0; y - intercept of 7

64. ## Calculus

Find the arc length of the curve described by the parametric equation over the given interval: x=t^(2) + 1 y=2t - 3 --> 0

asked by Liz on April 16, 2013
65. ## Algebra II

Find the exact solutions to the quadratic equation in the complex numbers. (x-13)²=-36 HELP ME PLEASE!

asked by hot on July 1, 2011
66. ## Calculus 1

Use Newton's method to approximate the root of the equation x^3+x+2=0 with initial guess x1=-1 gives:

asked by Olivia on October 31, 2011
67. ## Physics

What is the value of a if the object is moving with constant velocity? What does this equation reduce to in such a case?

asked by Vicki on September 27, 2009
68. ## trig

Find all solutions to the equation 2cos(2x) = x + 1, correct to 4 decimal places.

asked by sam on October 2, 2011
69. ## chemistry

what is the word and balanced chemical equation for oxalic acid and marble?

asked by sarah on April 18, 2013
70. ## algebra 1

Choose the equation of the line passing through the point (-1, -2) and perpendicular to y = one fourthx + 2.

asked by Anonymous on May 20, 2011
71. ## Math

'Write down the equation of the line passing through 2,1 and perpendicular to 2x-4y-1=0 I tried figuring out what to do but I don't know how to.

asked by fay.... pls help on July 5, 2015
72. ## Chemistry

How do you write a chemical equation for NH4NO3? Is it... NH3 + H2O= NH4 + OH

asked by Patrick on March 19, 2013

Write the equation of the circle that passes through the point (3,4) and has its center at (1,2). Answer: (x-1)^2 +(y-2)^2 = 8 Thanks for the help.

asked by Lucy on October 11, 2008
74. ## Chemistry

Write a balanced equation for copper oxide + Ethanoic Acid

asked by Eloise on October 2, 2011
75. ## Chemistry

For an equation N2(g)+3H2(g) double arrowed to give 2NH3(g) what is the catalyst?

asked by Omoniyi Ayodeji on July 8, 2015
76. ## Equations

Graph the equation x=5/2 how would i start this?? I tend to make things too difficult for myself...

asked by Kathy on October 8, 2009
77. ## Algebra

Expand the expression without exponents log4 x^4y^7/4 how do I start solving this equation? Thanks, for your help.

asked by Deb on April 16, 2013
78. ## Physics

I've read all my resource materials and looked for outside resources already and i can't find an equation for this. I would appreciate any help

asked by randy on July 8, 2015
79. ## Algebra

Write the slope-intercept equation for the line that passes through (-3,-15)and is perpendicular to -6x+8y=3

asked by Jackie on November 2, 2011
80. ## math

insert a pair of parentheses in equation to show the associative property.

asked by lucas on August 22, 2011
81. ## math

my equation is y= -x-3. the y-intercept is (0,-3) and the slope is -1. if i were to draw a chart starting from x being -3. would it be like this: (-3,0) (-2,-1) (-1,-2) (0,-3) (1,-4) (2,-5) (3,-6) just want to know if it is correct

asked by kara on October 17, 2011
82. ## Honors Chemistry

Predict Products and write balanced equation FeBr3 + 3Ba(0H)2

asked by Jon on December 3, 2015
83. ## Math

write the following equation in slope intercept form 3x+4y=12 I'm lost on this question

asked by Lucy on November 3, 2015
84. ## algebra

Determine the equation of g(x) that results from translating the function f(x) = x^2 + 9 upward 11 units.

asked by Anonymous on March 31, 2013
85. ## maths

In parabola, give any example of a quadratic equation which doesnot touches the x-axis only.

asked by anoynomous on April 5, 2013
86. ## Math

Insert parentheses to make this equation correct: 7 - 6 x 7 / 5 + 7 = - 43.4 / is used for division sign

asked by Sue on May 7, 2015
87. ## physics dimensions

the displacement of a particles is given by S=A+Bt+Ct^2.deduce the values of the constant A,B,and C appearing in the equation

asked by Anonymous on January 8, 2016
88. ## Algebra

For which value of b would make the equation 3|x-2|=bx-6 have infinitely many solutions? How would I find the values? The choices are -6,-3,3,6.

89. ## Algebra

What is the equation expression for the difference of twice a number G and 10 is 24 ? I was thinking it was 2g * 10=24 but I'm sure it's highly wrong

asked by Kenzie on August 26, 2015
90. ## Equation help plz

If x and y satisfy the equation (x+5)^2+(y-12)^2=14 then find the minimum value (x^2+y^2) plz help show working

asked by Collins on January 5, 2016
91. ## Chemistry

Net Ionic Equation for reaction between bromide and silver nitrate

asked by Teresa on April 22, 2013
92. ## chemistry

What is the complete ionic equation for CaS(aq) +CuCl2(aq)=CuS(s)+CaCl2(aq)

asked by lupe on April 8, 2010
93. ## algebra

determine the equation of the line through the points (8,2) and (-4,-1) Please explain and show work

asked by Ella on May 23, 2013
94. ## Trig

Find all solutions of equation on interval [0,2pi] 1=cot^2x + cscx

asked by LSAT on June 2, 2011
95. ## Trig

Find all solutions of the equation on the interval [0,2pi): Tan^2x=1-secx

asked by Lsat on June 2, 2011
96. ## chemistry

How can I change ca(hco3)2+cl(aq)=cacl2(aq) + co2(g) + h2O in to ironic equation?

asked by marcellino on May 28, 2015
97. ## math

write a polyoil equation ofleast degree for each set of roots +/-2i,3,-3.

asked by tashonda on September 19, 2011
98. ## Math

State all possiblities for the number of solutions a quadratic equation can have in one cycle.

asked by Mary on December 30, 2015
99. ## geometry

write an equation of a line with undefined slope that passes through the point (3,-2

asked by Devan on September 24, 2009
100. ## algebra

wright the slope-intercept form of the equation of the line described though:(-2,5), parallel to y=-9/2x+3

asked by roseann on August 19, 2015