Question

Factor x^2+10x+21

Answer 1

what 2 numbers have product =21 and sum = 10 ??

Answer 2

3 X 7 =21 3+7 = 10

Answer 3

thats right!
so u write 10x as 3x+7x
ok?
x^2+3x+7x+21
do u know what to do next?

Answer 4

factor by grouping?

Answer 5

yes, try it and tell me what u get?

Answer 6

(x+3)(x+7)

Answer 7

that is correct final answer!
good work :)

Answer 8

thank yu c:

Answer 9

welcome ^_^

Answer 10

oops i am late :) nicely done @hartnn

Answer 11

thanks :)
i'll leave next problem for u :)

Answer 12

thats kind of you