(x-2)(x+9)=-10

Solution for (x-2)(x+9)=-10 equation:

(x-2)(x+9)=-10

We move all terms to the left:

(x-2)(x+9)-(-10)=0

We add all the numbers together, and all the variables

(x-2)(x+9)+10=0

We multiply parentheses ..

(+x^2+9x-2x-18)+10=0

We get rid of parentheses

x^2+9x-2x-18+10=0

We add all the numbers together, and all the variables

x^2+7x-8=0

a = 1; b = 7; c = -8;
Δ = b2-4ac
Δ = 72-4·1·(-8)
Δ = 81
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{81}=9$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-9}{2*1}=\frac{-16}{2}
=-8
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+9}{2*1}=\frac{2}{2}
=1
$