Question

[8.04] Find the factors of 2a2 + a − 21.

Answer 1

could u factor by grouping?

Answer 2

i didnt think so because this is a trinomial.

Answer 3

but u still can factor by grouping it does not matter

Answer 4

or what method u need to use?

Answer 5

This is the question and the answers it gave me. I tried using the FOIL method with the answer choices, but i just kept coming up blank. . . .
[8.04] Find the factors of 2a2 + a − 21.

(2a + 21)(a − 1)

(2a + 1)(a − 21)

(2a + 3)(a − 7)

(2a + 7)(a − 3)