Question

solve. x2 + 15x = -56

Answer 1

answer choices:
x = 8 and x = 7
x = -8 and x = -7
x = -8 and x = 7
x = 8 and x = -7

Answer 2

well set it up as a nice quadratic equation we can follow

x^2 + 15x + 56 = 0

factor that bad boy

(x+8)(x+7) = 0

well what values for x would make the left hand side equal zero?

-8 and -7 of course

so x = -8 and x = -7