How do you factor this x4 -16x2 plus 36?

Answer 1

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The quartic polynomial that seems to be given has no rational factors: even if the first term were x^2 or the second 16x^2.

Answer 2

It is equivalent to x - 4x36 that means x = 144

Answer 3

(x^2 - 2x - 6)(x^2 + 2x - 6)