SOLUTION: factor the expression completely: x^4-9x^2 please help me as as u cannnnnnnnnnnnnnnnn waiting for replyyy

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Question 446368: factor the expression completely:
x^4-9x^2
please help me as as u cannnnnnnnnnnnnnnnn
waiting for replyyy
Found 3 solutions by mananth, nerdybill, ikleyn:
Answer by mananth(16949) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E4-9x%5E2
Difference of two squares ( Identity)
%28x%5E2-3x%29%28x%5E2%2B3x%29

Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
Think "difference of squares"...
.
x^4-9x^2
x^2(x^2-9)
can be rewritten as:
x^2(x^2-3^2)
x^2(x-3)(x+3)

Answer by ikleyn(53419) About Me  (Show Source):
You can put this solution on YOUR website!
.
factor the expression completely:
x^4-9x^2
~~~~~~~~~~~~~~~~~~~~~~~


x^4 - 9x^2 = x^2*(x^2-9) = x^2*(x-3)*(x+3).

Factored completely.