Factor each polynomial by grouping. See Example 2.Concept Check Layla factored 16a2 − 40a...

Factor each polynomial by grouping. See Example 2.

Concept Check Layla factored 16a2 − 40a − 6a + 15 by grouping and obtained (8a − 3) (2a − 5). Jamal factored the same polynomial and gave an answer of (3 − 8a) (5 − 2a). Which answer is correct?

EXAMPLE 2

FACTORING BY GROUPING