## anonymous one year ago Solve x2 + 15x = -56. x = 8 and x = 7 x = -8 and x = -7 x = -8 and x = 7 x = 8 and x = -7

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1. pooja195

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

2. pooja195

how would we make it look like that ^

3. SolomonZelman

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

4. SolomonZelman

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