Question

x^2-10x+21=0

Answer 1

you are looking for two negative numbers that multiply up to 21 and add up to -10

Answer 2

x^2 -7x-3x+21=0
x(x-7)-3(x-7)=0
(x-3)(x-7)=0 so x=3 or x=7

Answer 3

I GET IT

Answer 4

THANK YOU