Factor completely the polynomial. Indicate any that are not factorable using integers.

Question

x 2 – 4 x – 32.
Answer

(x + 4)(x + 8)
(x – 4)(x – 8)
(x + 4)(x – 8)
(x – 4)(x + 8)
not factorable

Answer 1

If I were you, I would expand the possible answers and see what I would get.
Clearly it can't be the first two, since those expansions would give you a + 32 at the end, so ....