SOLUTION: Solve the quadratic equation {{{(x+9)^2-81=0}}} by taking the square root. x= x=

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Solve the quadratic equation {{{(x+9)^2-81=0}}} by taking the square root. x= x=      Log On


   

Question 1026528: Solve the quadratic equation %28x%2B9%29%5E2-81=0 by taking the square root.
x=
x=
Answer by EdenWolf(517) About Me  (Show Source):
You can put this solution on YOUR website!
%28x%2B9%29%5E2-81=0
First, add 81 to both sides.
%28x%2B9%29%5E2=81
Now, take the square root of both sides.
sqrt%28%28x%2B9%29%5E2%29=sqrt%2881%29
x%2B9=9 and x%2B9=-9
Subtract 9 from both sides for both equations.
ANSWER: x=0 and x=-18