SOLUTION: How do I factor this? {{{ x^4 -13x^2 + 36}}} The answer is (x -2) (x + 2) (x -3) (x + 3) This seems to be a case of difference of squares, but I don't know how to factor i

SOLUTION: How do I factor this? {{{ x^4 -13x^2 + 36}}} The answer is (x -2) (x + 2) (x -3) (x + 3) This seems to be a case of difference of squares, but I don't know how to factor i

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Question 903854: How do I factor this?

The answer is (x -2) (x + 2) (x -3) (x + 3)
This seems to be a case of difference of squares, but I don't know how to factor it with a 4th degree.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

-4 and -9 both add to -13 and multiply to 36

Difference of squares rule

Difference of squares rule

Note: the order of the factors doesn't matter.
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