Question

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

We need to factor this we need it to look like this
\[\huge~\rm~ax^2+bx+c=0\]

Answer 2

how would we make it look like that ^

Answer 3

test the discriminant
\(\large\color{black}{ \displaystyle x^2 + 15x +56=0}\)
\(\large\color{black}{ \displaystyle {\rm Discriminant} = \sqrt{15^2-4\cdot1\cdot56}}\)
\(\large\color{black}{ \displaystyle {\rm Discriminant} = \sqrt{225-224}=1}\)

Answer 4

u can factor it. Or go by the quadratic formula if you want to continue and not to lose my work