SOLUTION: Please solve the exponential equation: {{{(5x^2/5^(3x))=625}}}

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Question 172993: Please solve the exponential equation:
%285x%5E2%2F5%5E%283x%29%29=625
Answer by Alan3354(21611) About Me  (Show Source):
You can put this solution on YOUR website!
Please solve the exponential equation:
%285x%5E2%2F5%5E%283x%29%29=625
%285%5E%28x%5E2-3x%29%29=5%5E4
x%5E2+-+3x+=+4
x%5E2+-+3x+-+4+=+0
(x-4)*(x+1) = 0
x = 4
x = -1