Question

Factor the following polynomial completely.

5x ^3+ 2x^2 – 45x –18

Answer 1

(5x+2)(x-3)(x+3)

Explanation:

factor x²

5x ³+ 2x² – 45x –18

x²(5x+2)-45x-18

factor 5x+2

(5x+2)(x²-9)

factor using the method of a²-b²=(a-b)(a+b)

(5x+2)(x-3)(x+3)