SOLUTION: Solve the following quadratic equations. 〖(x-4)〗^2=81 Using the quadratic formula, solve 3x^2+6x-21=0

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Question 1038302: Solve the following quadratic equations.
〖(x-4)〗^2=81






Using the quadratic formula, solve 3x^2+6x-21=0
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
%28x-4%29%5E2=81, both sides are squares. Nothing too complicated.



3x%5E2%2B6x-21=0
Easily simplified first:
x%5E2%2B2x-7=0

x=%28-2%2B-+sqrt%282%5E2-4%2A1%28-7%29%29%29%2F2
Simplify from that.