SOLUTION: solve the quadratic equation: (x+3)^2=81 please help thanks

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Question 52871: solve the quadratic equation:
(x+3)^2=81
please help thanks
Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
Using the square root property:
%28x%2B3%29%5E2=81
sqrt%28%28x%2B3%29%5E2%29=%2B-sqrt%2881%29
x+3=+or-9
x+3-3=-3+or-9
x=-3-9
x=-12
and
x=-3+9
x=6
x=-12;x=6
Not all teachers require set notation:
In set notation x={-12,6}