Please explain how you got your answer, question is attached below

1. Factor x^3 + 9x^2 + 6x - 16 using Polynomial Division
(x^2 + 10x + 16)(x -1)
2. Factor x^2 + 10x + 16
(x + 2)(x + 8)(x - 1)
Answer: x - 1
Answer:
x - 1
Step-by-step explanation:
width = volume / height * length
= x^3 + 9x^2 + 6x - 16 / (x + 2)(x + 8)
Since the volume ends in -16 and last term of denominator
= +2 * + 8 = +16 the least term of the width will be - 1.
Also x^3 / x^2 = x
so the answer is (x - 1)