Your answer for this will be B (z+3)(z-6). Since the original equation has two negatives, the answer has to have one positive and one negative so the negatives don't cancel each other out and create a positive. To find the numbers in the parenthesis, you need to find something that multiplies to -18 and also adds to -3 at the same time. Choice B is correct because -6x3=-18 and -6+3=-3.
