SOLUTION: Could you please help me with this problem: Solve for x: {{{2x^4-26x^2+72=0}}}

Question 21481: Could you please help me with this problem:
Solve for x:
Found 2 solutions by venugopalramana, Earlsdon:
Answer by venugopalramana(3286) (Show Source): You can put this solution on YOUR website!
Solve for x:
X^4-13X^2+36=0
X^4-4X^2-9X^2+36=0
X^2(X^2-4)-9(X^2-4)=0
(X^2-4)(X^2-9)=0
X^2=4......................OR..............X^2=9
X=2..OR..-2............OR.......X=3...OR......-3

Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Solve for x:
Factor out a 2.
Factor the parentheses.
Factor the parentheses again.
Apply the zero product principle.
and/or and/or and/or
The roots are:
x = -2
x = 2
x = -3
x = 3
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