Question

Please help !!!
Solve.

x2 + 15x = -56

x = 8 and x = 7

x = -8 and x = -7

x = -8 and x = 7

x = 8 and x = -7

Answer 1

x2+7x+8x+56=0
x(x+7) + 8(x+7)=0
(x+8)(x+7)=0
x+8=0 and x+7=0
x=-8 and x=-7

Answer 2

Thanks so much, now i'm starting to remember this from algebra 1