SOLUTION: In a quadratic equation, once you have something that looks like this- -9(plus/minus)(square root) 121. Do you (plus minus) the square root of the number or the actual number?

Question 447343: In a quadratic equation, once you have something that looks like this-
-9(plus/minus)(square root) 121. Do you (plus minus) the square root of the number or the actual number?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In a quadratic equation, once you have something that looks like this-
-9(plus/minus)(square root) 121. Do you (plus minus) the square root of the number or the actual number?
----
you add to get one value; then you subtract to get a second value
-----
-9 +/-sqrt(121)
---
-9+sqrt(121) = -9+11 = 2
----
-9-sqrt(121) = -9-11 = -20
==================================
Cheers,
Stan H.

RELATED QUESTIONS
how do you find the square root. the equation looks something like this:3+(the square... (answered by College Student)

I have a question about quadratic equation. I know if you need to square a negative... (answered by ankor@dixie-net.com,KMST)

My problem is solving each equation using the quadratic fromula, I know... (answered by mananth)

How do you solve 5x squared plus 16x minus 84 equals 0 using the quadratic equation... (answered by KMST)

how do you simplify the square root of 5 plus 1 all over the square root of 3 minus... (answered by Nate)

There is a plus sign over a minus sign in front of the square root symbol - I do not... (answered by RAY100)

I'm using a book called No-Nonsense Algebra by Richard Fisher. I've run into a problem... (answered by MathLover1,math_helper)

I'm supposed to express this in simplest radical form. (square root of 2 minus 3)(square (answered by bucky)

what is square root of 2/7 minus square root of 7/2? what is 5 square root 16/3 minus... (answered by checkley79)