Question

can anyone solve this ? Factor the trinomial.
a^2 − 3a − 40

Answer 1

Find two numbers that multiply out to AC and add up to B. Thus, two numbers that multiply to -40 and add up to -3.

Answer 2

Those values are -8 and 5.
Thus, the factored form is (a-5)(a+8)=0

Answer 3

(a+5)(a-8)=0
(a+5)=0 and (a-8)=0
solve a

Answer 4

what about r^2 − 7r − 10?