(c+9)(c+6)=-2

Solution for (c+9)(c+6)=-2 equation:

(c+9)(c+6)=-2

We move all terms to the left:

(c+9)(c+6)-(-2)=0

We add all the numbers together, and all the variables

(c+9)(c+6)+2=0

We multiply parentheses ..

(+c^2+6c+9c+54)+2=0

We get rid of parentheses

c^2+6c+9c+54+2=0

We add all the numbers together, and all the variables

c^2+15c+56=0

a = 1; b = 15; c = +56;
Δ = b2-4ac
Δ = 152-4·1·56
Δ = 1
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1}=1$
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(15)-1}{2*1}=\frac{-16}{2}
=-8
$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+1}{2*1}=\frac{-14}{2}
=-7
$