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

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: factor the expression completely: x^4-9x^2 please help me as as u cannnnnnnnnnnnnnnnn waiting for replyyy      Log On


   

Question 446368: factor the expression completely:
x^4-9x^2
please help me as as u cannnnnnnnnnnnnnnnn
waiting for replyyy
Found 2 solutions by mananth, nerdybill:
Answer by mananth(16946) 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)