# 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 118-
## Algebra

the foci of the ellipse given by the equation 100x2 + 25y2 = 2500?

*asked by Aaron on December 13, 2016* -
## Math

How do I write an quadratic equation whose roots are -2 and 6 and whose leading coefficient is 2

*asked by Sabrina on September 23, 2018* -
## algebra

find the equation of the perpendicular line to y=1/2x+4 and passing through the point (1,-2) PLEASE HELP :)

*asked by john on June 12, 2011* -
## chemistry

pls balance the equation AL3C4+H2O-CH4+AL(OH)3

*asked by seun on October 30, 2015* -
## Chemistry

What is the molecular ratio in the following equation:H2O + SO3 = H2SO4

*asked by Beth on November 11, 2010* -
## Algebra

Determine whether the graphs of the given equation are parallel, perpendicular, or neither. Explain y=4x-2 -X+4y=0

*asked by Mom on November 2, 2015* -
## Chemistry

Complete and balance the following equation: NO2{-} + Cr2O7{2-} = Cr{3+} + NO3{-}

*asked by Steven on April 16, 2012* -
## math

help pleaSE factorable quadratic equation and solve for the roots: 2x^2 + 13x + 20=0

*asked by WINSTON on March 9, 2014* -
## math

what is the equation in point-slope form for the line parallel to y=-2x+10 that contains j(6,8)?

*asked by Anonymous on March 9, 2014* -
## Chemistry

In de Broglie's equation w=wavelength w=h/mv how do i rearrange to solve for mass

*asked by Megan on March 8, 2015* -
## Analytic Geometry

What is the equation of the circle touching the lines x-3y-11=0 and 3x-y-9=0 having its center on the line x+2y+19=0 .

*asked by John on May 5, 2013* -
## Algebra

What is an equation in point slope form for the line perpendicular to y=7x+3 and contains (-6,-3) ? A)y+6=-1/7 (x+3) B)y+3=7 (x+6) C)y+3=-1/7 (x+6) D)y+3=7 (y+6)

*asked by Savannah on September 22, 2016* -
## EASY GRAPHING QUESTION

Write the equation of a circle with a center at (15, –35) and a diameter of 100.

*asked by Vince on June 7, 2011* -
## maths --plse help me..

solve the following equation by method of completing the perfect square:- 4x^2 + 4 √3 x +3=0

*asked by Anonymous on December 13, 2012* -
## Differenctial equations

Use the change of variable x = exp(s) to recast the differential equation xy′′+y′+(L/x)y=0 Please HELP ME

*asked by lili on October 14, 2011* -
## math!HELP!!

write a quadratic equation in the variable x having the given numbers as solutions. Use ax^2 + bx + c=0 Thanks so much for the help

*asked by barb on November 12, 2010* -
## calculus

solve the differential equation that satisfies the given condition: dy/dx=(ycos(x))/(6+y^2), y(0)=1

*asked by Lauren on October 17, 2015* -
## business math

Translate the following statement into an equation: A number (X) decreased by 4 is 25. (Points : 2)

*asked by TM on April 30, 2013* -
## Calculusmath

what is an equation of the conic section x^2+y^2=16 after a rotation of 45 degrees about the origin. A. (x')^2+(y')^2=16 B. (x')^2- (y')^2=16 C. (x')^2- 2x'y'+(y')^2=16 D. (x')^2+ 2x'y'+(y')^2=16

*asked by bob on March 12, 2014* -
## math

For questions 1 and 2 solve the equation for the variadable f - 354 = 1,221 help

*asked by Skyler on October 9, 2018* -
## mathematics

What is an equation of ellipse centre at c(-1,2),focus at f(-1,5)& passes through point p(5,6).

*asked by salim on December 24, 2016* -
## Algebra

Determine the number and type of solutions for the quadratic equation: 4X^2 + 3X= -8

*asked by Kim on October 9, 2018* -
## precalculus

find two sets of parametric equations for the given rectangular equation x+y^2=4

*asked by Anonymous on December 12, 2016* -
## Mat/117 Concept

• If you are looking at a graph of a quadratic equation, how do you determine where the solutions are? Please provide and example.

*asked by Rose on March 4, 2012* -
## 8th grade math

please help! x y 1 135 2 220 3 305 what is the expression/equation that could be used to find y?

*asked by ella on November 12, 2015* -
## Algebra

Write linear equation in form y=mx+b given this condition parallel to y=-1/2x +1, through (4,2)?

*asked by Sherry on May 17, 2013* -
## Physics

Can anyone write a mathematical equation to represent Charles law?

*asked by Schylar on May 31, 2013* -
## Calculus 1

Find an equation of the tangent line to the curve at the given point. y =(1+2x)^12, (0,1)

*asked by TayB on March 4, 2015* -
## advanced math

Math the equation a single logarithm. Express as factors. ln(x/(x-1))+ln((x+1)/(x))-ln(x^2-1)

*asked by kristina on December 3, 2012* -
## chemistry

what is the balanced equation of NaHCO3+CH3OOH---->H2CO3+NaCH3COO

*asked by michelle on May 28, 2011* -
## physical science

Balance this chemical equation. ___ K(s) + ___H2O(1) >>>>> KOH(aq) + H2(g)

*asked by BDM on January 5, 2011* -
## Math

Create a word problem system of equation that has an answer x=1.25 and y= 2.75.

*asked by Cole on June 6, 2018* -
## Algebra

solve the following literal equation for r v=pi r^2h I got r=+/- sq root v/pi•h am i done or do i need to eliminate signs?

*asked by Shirley on August 8, 2018* -
## Algebra

What is the vertex form of the equation? y=x^2-6x+8 I have the answer I just need to make sure I have the steps.

*asked by Rach on October 20, 2015* -
## Calculus (derivatives)

find an equation of the tangent line to the curve at the indicated point. y = -(x^1/3); (8, -2)

*asked by Nemo on October 13, 2011* -
## science

vertical distance equation for a freely falling object

*asked by Anonymous on May 11, 2013* -
## Geometry

What is an equation in point-slope form for the line perpendicular to y=2x+13 that contains (8,-4)?

*asked by Sierra on March 9, 2014* -
## Math

What is an equation for the function that gives the values in the table? xl 2 l 3 l 4 l yl10l13l16l In other words, x-2, y-10, x-3 y-13, x-4 y-16

*asked by Bernice on May 28, 2011* -
## maths

PT bisects QR perpendicularly.P is a point on the y-axis.if Q(1;8) and R(6;1). Find the equation of PT

*asked by oarabile mpane on April 19, 2012* -
## Implicit Differentiation (Please HELP)

Write the equation of the line tangent to the curve x^2 − 4y^2 + 192 = 0 at (8, 8) Thank You

*asked by Tom on March 24, 2015* -
## Math

What is an equation for the function that gives the values in the table? xl 2 l 3 l 4 l yl10l13l16l In other words, x-2, y-10, x-3 y-13, x-4 y-16

*asked by Bernice on May 28, 2011* -
## math

what is an equation for the line that passes through the coordinates (2,0) and (0,3)? (1) y=-3/2x+3 (2) y=-3/2x-3 (3) y=-2/3x+2 (4) y=-2/3x-2 explain the steps too please. :)

*asked by lil on June 3, 2010* -
## Math

Solve this multiple-angle equation. cos x/2 = -(sqrt3)/2

*asked by Anonymous on October 18, 2015* -
## Math

What is an equation for the function that gives the values in the table? xl 2 l 3 l 4 l yl10l13l16l In other words, x-2, y-10, x-3 y-13, x-4 y-16

*asked by Bernice on May 28, 2011* -
## chemistry

classify each reaction and balance the equation Al(OH)3--> Al2O3 + H2O

*asked by taylor on March 30, 2010* -
## Analytic Geometry

What is the equation of the circle touching the lines x-3y-11=0 and 3x-y-9=0 having its center on the line x+2y+19=0

*asked by xavier on January 31, 2013* -
## MATH

WRITE A WORD PROBLEM FOR THE EQUATION 12N-45=504.

*asked by L on May 16, 2015* -
## Algebra 1b

Determine the equation of g(x) that results from translating the function from f(x)=(x+2)^2 to the right 6 units

*asked by Lisa on May 4, 2014* -
## Math

Solve the equation. Round to the nearest tenth if necessary. x2 = 169

*asked by Derwin on March 22, 2012* -
## calculus

Solve the equation 2cos(x)+1=0,0≤x≤2π0≤x≤2π. Show all of your work.

*asked by rosie on March 13, 2019* -
## math

. Find the roots of the polynomial equation. x2 + x undefined 72 = 0 (Points : 1) 9 and 8 6 and 6 2 and 16 9 and 8

*asked by vilmaa on March 18, 2013* -
## algebra

What is the value of n in the equation 12n + 8 = 11? Please submit your answer as a reduced fraction.

*asked by eric on March 21, 2012* -
## Analytic Geometry

Find the equation of the circle touching the lines x+2y=4, x+2y=2 and y=2x-5 Please I need help, its for my homework

*asked by Lea on January 31, 2013* -
## algebra 1

can some one please help me with this equation using the addition principle -9/5 + x = -2/9 Please explain how you got your answer in all phases. Thanks

*asked by robbie on December 8, 2010* -
## algebra

Write an equation of the line, in the form of y = mx + b that passes through the given points. 3. (0,5),(-2,0) 5. (1,4),(3,8)

*asked by Anonymous on April 6, 2010* -
## Chemistry

Have I balanced this equation correctly CN + NaOCL---OCN + NaCl

*asked by Mel on April 6, 2010* -
## Math

can you write the equation that represents the relationship between quantity and price given: X 0=0, 1=6, 2=12, 3=18, 4=24 Y 0=0 1=5 2=10 3=15 4=20

*asked by aManZ on March 7, 2019* -
## Analytic Geometry

What is the equation of the circle touching the lines x-3y-11=0 and 3x-y-9=0 having its center on the line x+2y+19=0

*asked by xavier on January 31, 2013* -
## Maths

What is the equation, in the form y= x^2 + bx + c of the parabola which passes through the points (-3,0) and (1,-16)? y=a(x-s)(x-q) y=a(x-(-3))(x-1) y=a(x+3)(x-1) y=a(x^2+2x-3) I'm confused...

*asked by Debora on October 16, 2016* -
## college algebra

The goal of this problem is to solve the equation by completing the square. x^2-9x+14=0

*asked by john on September 13, 2011* -
## MATH

Find the area of the part of the plane with vector equation r(u, v) = that is given by 0 ≤ u ≤ 1, 0 ≤ v ≤ 1.

*asked by Taylor on November 16, 2016* -
## beginning algebra

find 3 ordered pairs the satisfy the equation 2x + 10y = 25

*asked by margie on October 19, 2016* -
## chemistry

equation of the reaction of hydrochloric acid and iron sulphide

*asked by melody on November 29, 2010* -
## algebra 2

Write a quadratic equation with roots 2 - 3i and 2 + 3i. I just need confirmation I did it correctly. I got y = x^2-4x+13

*asked by Allie on November 17, 2016* -
## Geometry

Point M is the midpoint of the line equation ABMC. Which of the following is not true? (1)AM = MC (2) AB < MC (3) AM > BC or (4) BM < MC

*asked by Linda on March 12, 2013* -
## algebra 2

to solve the system of equations which expression could be substituted for x into the first equation? first: 2x+7y=10 second: x-2y=15

*asked by Anonymous on February 2, 2013* -
## math for college readiness

Suppose y varies directly with x. Write an equation relating x and y. y = −30 when x = 6

*asked by jessica on May 17, 2015* -
## Linear equation

When mona was born her father was 25years old What will be the linear equation

*asked by Anonymous on October 17, 2016* -
## calculus

Given ƒ(x) = 2x^2 - 3x - 1 find the slope and equation of the tangent line to ƒ at the point (1, -2)

*asked by Matt on March 13, 2013* -
## Trig

What are the focus and directrix of the parabola represented by the equation:8(y-6)=(x+2)squared?

*asked by Emily on November 21, 2016* -
## East

I need an equation that has something to do with the role of static friction in the design of tires

*asked by Jess on January 31, 2013* -
## arithmetic

If you have the terms 64, 49, 36, 25, 16, 9, 5, and 1 what equation will work to find the nth term?

*asked by Anonymous on September 19, 2011* -
## Linear algebra

find an equation of a plane containing a point (0,6,-2) and parallel to vector v1= (0,-3,0), v2=(0,9,-1) Help!

*asked by J Velji on November 25, 2010* -
## Precalc

Find the smallest positive answer to the equation: sin(2x)=1

*asked by Lori on April 7, 2010* -
## maths

find the equation of plane passing through point(0,7,-7) and containing line x+1/-3=y-3/2=z+2/1

*asked by Anonymous on January 29, 2013* -
## Algebra

Solve the exponential equation. 4^2x – 2 = 26 I know I use the one to one property to equate. But I am confused. Thanks!

*asked by Meghan on July 29, 2011* -
## Calculus

Find the equation of the tangent line to f(x)=sec x - 2 cos x at (pi/3, 1).

*asked by Anonymous on August 30, 2015* -
## chemistry

complete the equation for the reaction of the soap with magnesium chloride

*asked by Dela on October 9, 2016* -
## math

Add two operational signs to make the equation true. 2 4 6 1 3=88

*asked by Anonymous on January 28, 2013* -
## CHEMISTRY

write the balanced ionic equation of K2CO3+HCl

*asked by GODBLESS on January 28, 2013* -
## Math

Describe in your own words how to solve a linear equation or inequality

*asked by Raul on July 27, 2011* -
## Algebra

Write the word phrase as an algebraic equation The ratio of 16 to x

*asked by Monica on August 31, 2015* -
## MATH/OPTICS

given di=145, do=38,hi=-97 formula: hi/ho=-di/do how do i rearrange this?? i do not want the answer. need help rearranging equation please help!!

*asked by lily on April 12, 2010* -
## Algebra

find the intercepts and graph the equation by plotting points. Y=2-2x^2

*asked by Amanda on September 24, 2011* -
## Analytic Geometry

Find the equation of a circle passing through (-1,6) and tangent to the lines x-2y+8=0 and 2x+y+6=0. Please I really need your help. I just do not know what to do.

*asked by Lea on January 28, 2013* -
## math

REmove one toothpick to make a true equation I-III=II

*asked by jbcbjbi on December 11, 2010* -
## Calculus

Find the equation of a circle with center C(1,6) and tangent line x-y-1=0.

*asked by Cad on July 29, 2011* -
## Math

How do you find the quadratic equation, in standard form, that has the roots x= (2±√5)/3

*asked by Lily on May 5, 2015* -
## Calculus

Let f(x)= 6x+(4/x^2). Then the equation of the tangent line to the graph f(x) at the point (2,13) is give by y=mx+b What is m? What is b?

*asked by Anonymous on January 30, 2013* -
## MAT/117

The weight of an object varies on different planets. Solve the equation w=Cr^-2 for r

*asked by Anonymous on September 20, 2011* -
## algebra2

write the slope-intercept form of the equation of each line x-y=-7

*asked by Gwen on August 20, 2015* -
## algebra

solve each exponential equation. Given the value for x 8^x=1/64 3^x=6 Can someone show me how to preform these. I would greatly appreciate it Thank You

*asked by Mary on May 7, 2014* -
## algebra homework help

The sum of two consecutive integers is 285 How would I solve an equation like this

*asked by jennifer on October 11, 2016* -
## math

four times a number increased by 5 is 37 translate this into algebraic equation

*asked by kent yrell on November 24, 2016* -
## math

how do I figure out how to write an equation (and solve the problem) for algorithm?

*asked by preston on September 21, 2011* -
## mathematics

Find the equation of the parabola with the vertex at the origin and directrix y =5

*asked by victor on August 3, 2011* -
## Algebra

When will the dependent variable in the equation Y=[(sqrt)(x+4-3)] equal or exceed 4? • x ≥ –0.17 • x ≥ 45 • x ≥ 48 • x ≥ 53

*asked by Sandra on May 9, 2014* -
## calculus

Find an equation(s) of the circle(s) described. Tangent to x + y = 0 and x - y - 6 = 0; center on 3x - y + 3 = 0. How do you solve this?

*asked by hfdsgds on March 18, 2012* -
## pre calculus

given points (0,0) (0,5) vertical asymptote of (-1,1) and horiz (2,1) how do I find the equation??????

*asked by M on September 22, 2011* -
## Maths

From the differential equation of the family of straight lines having y-intercept 3

*asked by Shahana on February 25, 2019*

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