Question

what are the solutions of x^2+10x+21=0?

Answer 1

(x+7)(x+3) so therefore you set each equation = 0...
x + 7 = 0
x + 3= 0
and solve
x = -3
x = -7

Answer 2

x=−7,−3x=−3,−7
These are the only solutions that I could find