x power 4 - 5 x square + 4
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Step-by-step explanation:
x^4 -5x^2 +4
x^4 -4x^2 - x^2 +4
x^2(x^2 - 4) - (x^2 - 4)
(x^2 - 1 )(x^2 - 4)
now, as we know, a^2 - b^2 = (a+b)(a-b)
(x^2 + 1)(x^2 - 1)(x^2 + 2)(x^2 - 2)
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