Question

Find the factors of 3a2 − 13a − 10.

(3a + 10)(a − 1)

(3a + 1)(a − 10)

(3a + 2)(a − 5)

(3a + 5)(a − 2)



please explain

Answer 1

From a casual inspection of the four choices, it appears that the only one that when multiplied out equals the 3a2-13a-10 is the third one, the rest do not give you the -13a required when combined.