Question

The factors of 5y2 − 2y − 7 are (5y − 7) and (???)

Answer 1

5y2 − 2y − 7 = (5y − 7) (y + 1)

answer 
5y2 − 2y − 7 are (5y − 7) and (y + 1)

Answer 2

You want to know what you can multiply to (5y - 7) to get 5y^2 - 2y - 7.

5y^2 / 5y = y

-7/-7 = 1

So we have (y + 1)