Question

Solve x2 + 10x = -21.

Answer 1

do i add 21 to both sides?

Answer 2

yes

x^2 + 10x + 21 = 0

now factor

Answer 3

(x + 10 ) (x + 11 )??

Answer 4

@Vocaloid

Answer 5

nope, not quite

what two numbers have a sum of 10 and a product of 21?

Answer 6

(x+7) (x+3)?

Answer 7

good!

that gives us

(x+7)(x+3) = 0

now solve for x

Answer 8

x=-7 x=-3 ?

Answer 9

great, that's it ^_^

Answer 10

thank you