Homework Help: algebra 1

Posted by Dippy on Sunday, March 1, 2009 at 11:46pm.

how do you factor 16x^4 - 40x^2 + 9 I don't understand how the factoring should go. When I think of a way to factor it it doesn't turn out right.

algebra 1 - Reiny, Monday, March 2, 2009 at 12:54am
(4x^2 - 9)(2x^2 - 1)
= (2x + 3)(2x - 3)(2x^2 - 1)
algebra 1 - drwls, Monday, March 2, 2009 at 1:06am
16x^4 - 40x^2 + 9 = (4x^2 -9)(4x^2 -1)
= (2x+3)(2x-3)(2x+1)(2x-1)

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