SOLUTION: Please help me: Solve by factoring:x^4-9x^2=0.

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Question 64795: Please help me: Solve by factoring:x^4-9x^2=0.
Answer by 303795(602) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E4-9x%5E2=0
Remove common factor of x%5E2
x%5E2%28x%5E2-9%29=0
Difference of squares
x%5E2%28x-3%29%28x%2B3%29=0
ie x=0 or x-3 or x=-3