Question

PLEASE HELPPPPP!!!!!!!!

Factor completely 21x3 + 35x2 + 9x + 15.

(3x − 5)(7x2 − 3)
(3x − 5)(7x2 + 3)
(3x + 5)(7x2 − 3)
(3x + 5)(7x2 + 3)

Answer 1

is so easy: (3x + 5)(7x² + 3)

Explanation:

1. 7x² × (3x + 5) + 9x + 15

2. 7x² × (3x + 5) + 3(3x + 5)

3. (3x + 5) × (7x² + 3)