# 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-
## Chemistry

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

*asked by Beth on November 11, 2010* -
## 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* -
## Math Help PLEASE!

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* -
## 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* -
## Math 8R - HELP!

Multi-Step Equations Systems of Equation 2x = y 4x - y = -2 please help!!!!!

*asked by Laruen on January 29, 2013* -
## Maths

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

*asked by Kennedy on December 17, 2016* -
## math

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

*asked by Primrose on March 12, 2014* -
## 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* -
## 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* -
## Pre Calculus

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

*asked by Alexis on March 13, 2014* -
## 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* -
## 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* -
## 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* -
## math

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

*asked by Anonymous on December 14, 2016* -
## 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* -
## 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* -
## 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* -
## Math

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

*asked by Jamie on October 29, 2017* -
## Math

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

*asked by Kim on March 14, 2018* -
## 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=?

*asked by Jayden Haddy on August 3, 2013* -
## 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* -
## 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* -
## 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* -
## 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* -
## math

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

*asked by Help on August 7, 2013* -
## geometry

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

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

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

*asked by Aaron on September 27, 2012* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 7th grade math

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

*asked by karen on November 13, 2012* -
## chemistry

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

*asked by melinda on November 4, 2013* -
## principles of algebra

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

*asked by zuly on September 26, 2012* -
## math

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

*asked by karen on November 12, 2012* -
## 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* -
## 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.

*asked by Jayden Haddy on August 11, 2013* -
## 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* -
## John

solve the quadratic equation 4x^3-20x^3+13x+12=0

*asked by Daniel on November 11, 2017* -
## Chemistry

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

*asked by Mary on January 28, 2009* -
## Quadratic Equations

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* -
## 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* -
## math

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

*asked by anet on October 25, 2013* -
## Math help

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

*asked by Nina on October 24, 2013* -
## 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* -
## 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* -
## math

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

*asked by olivia on February 11, 2010* -
## algebra math 208

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

*asked by anita on July 15, 2010* -
## 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* -
## 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* -
## 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* -
## 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* -
## Chemistry

Write an equation that explains the conductivity of NH3

*asked by Jackson on February 10, 2010* -
## math 208

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

*asked by anita on July 15, 2010* -
## 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* -
## Math help

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

*asked by Nina on October 27, 2013* -
## 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* -
## Algreba

Solve the following linear equation and simplify your answer. −18(y+34)=38(y+18)

*asked by Monica on October 25, 2017* -
## 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* -
## algebra

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

*asked by wanda on September 17, 2012* -
## 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* -
## Math

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

*asked by Neil on September 17, 2012* -
## 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* -
## chemistry

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

*asked by kate on February 3, 2009* -
## Math

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

*asked by Anonymous on October 6, 2017* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## MATH

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

*asked by Anonymous on September 29, 2017* -
## 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* -
## 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* -
## trig

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

*asked by bob on February 8, 2010* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## HELP ! Algebra

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

*asked by Robert on November 16, 2012* -
## math

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

*asked by key on January 4, 2009* -
## Math

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

*asked by Anonymous on November 7, 2013* -
## 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* -
## math

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

*asked by kate on July 24, 2013* -
## 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* -
## math 6th grade

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

*asked by agnes on January 4, 2009* -
## 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* -
## Math

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

*asked by Mia on October 12, 2017* -
## math

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

*asked by Jack on September 20, 2012* -
## math

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

*asked by Jack on September 20, 2012* -
## 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* -
## 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* -
## math

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

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

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

*asked by Anonymous on November 8, 2013* -
## math-PLEASE HELP ASAP!!(IF POSSIBLE)

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* -
## Algebra 1 (Reiny or Kuai)

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

*asked by Anonymous on November 8, 2013* -
## Algebra

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

*asked by James on October 11, 2017* -
## math

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

*asked by anynomous on September 12, 2010*

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