Question

solve for x

x^2+15x+36=0

Answer 1

(x+3)(x+12)=0

Answer 2

x=-3
x=-12

Answer 3

@elisasaab I plug them back in and they don't equal to zero

Answer 4

@bjschultze87 read on
for x=-3 and x =-12
\[
x^2+15x+36
(-3)^2 + 15(-3) +36= 9-45 +36=0\\
(-12)^2 + 15(-12) +36=144-180 +36=0
\]