Answer :

Domain is:

x is an element of a real number, but isn't equal to -4, 7 or -7.
Panoyin
(x² - 16)(x - 7) = (x³ - 7x² - 16x + 112) = 1 - 1 3/4 + 4 - 7 = -3 3/4
(x + 4)(x² - 4)       (x³ + 4x² - 4x - 16)

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