# 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-
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Math(Please help)

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* -
## 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* -
## 7th grade

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

*asked by Sophia on September 5, 2008* -
## 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* -
## 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* -
## 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* -
## algebra

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

*asked by Chico on June 27, 2011* -
## math

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

*asked by Ranch on September 6, 2007* -
## 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* -
## 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* -
## 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* -
## Math

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

*asked by Bob on September 16, 2009* -
## 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* -
## 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* -
## 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* -
## 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* -
## trig

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

*asked by Jill on May 24, 2011* -
## 10th grade math

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* -
## 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* -
## 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* -
## Advanced 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* -
## Math

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

*asked by Anonymous on September 10, 2009* -
## 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* -
## Chemistry

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

*asked by Kerry on February 21, 2013* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## MATH

Solve the equation algebraically for x where 0

*asked by Anonymous on September 3, 2009* -
## 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* -
## 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* -
## ALGEBRA

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

*asked by ggift on September 17, 2009* -
## 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* -
## 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* -
## 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* -
## 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* -
## trig

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

*asked by sam on October 2, 2011* -
## chemistry

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

*asked by sarah on April 18, 2013* -
## 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* -
## 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* -
## Chemistry

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

*asked by Patrick on March 19, 2013* -
## Pre-Calculus-check answers

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* -
## Chemistry

Write a balanced equation for copper oxide + Ethanoic Acid

*asked by Eloise on October 2, 2011* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## math

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

*asked by lucas on August 22, 2011* -
## 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* -
## Honors Chemistry

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

*asked by Jon on December 3, 2015* -
## 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* -
## 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* -
## maths

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

*asked by anoynomous on April 5, 2013* -
## 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* -
## 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* -
## 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.

*asked by Shadow on October 23, 2011* -
## 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* -
## 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* -
## Chemistry

Net Ionic Equation for reaction between bromide and silver nitrate

*asked by Teresa on April 22, 2013* -
## chemistry

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

*asked by lupe on April 8, 2010* -
## 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* -
## Trig

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

*asked by LSAT on June 2, 2011* -
## Trig

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

*asked by Lsat on June 2, 2011* -
## 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* -
## math

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

*asked by tashonda on September 19, 2011* -
## Math

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

*asked by Mary on December 30, 2015* -
## geometry

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

*asked by Devan on September 24, 2009* -
## 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*

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