Question

i need the anwser to this last question !
[8.03]

Factor completely: x2 − 4x − 21

(x + 7)(x − 3)

(x + 21)(x − 1)

(x − 7)(x + 3)

(x − 21)(x + 1)

Answer 1

Find two numbers that multiply to -21 and add to -4 at the same time

Answer 2

Those two numbers are...???

Answer 3

3 o;

Answer 4

you mean choice 3?

Answer 5

if you mean that, then you are correct

Answer 6

this is because -7 and 3 multiply to -21 AND add to -4 at the same time

Answer 7

of course ! thnk you !

Answer 8

you're welcome