4x^(2)(x - 4) + 36(x - 4)
(x - 4) is a common factor to both terms, hence
(4x^(2) + 36)(x - 4)
4(x^(2) + 9)(x - 4) Done!!!!
NB x^(2) + 9 does NOT factor .
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The answer varies depending on the missing operational signs. One possibility:
4x3 - 16x2 + 36x - 144 = 4(x - 4)(x2 + 9)