(x+2)(x-7)=-3x-10

Solution for (x+2)(x-7)=-3x-10 equation:

(x+2)(x-7)=-3x-10

We move all terms to the left:

(x+2)(x-7)-(-3x-10)=0

We get rid of parentheses

(x+2)(x-7)+3x+10=0

We multiply parentheses ..

(+x^2-7x+2x-14)+3x+10=0

We get rid of parentheses

x^2-7x+2x+3x-14+10=0

We add all the numbers together, and all the variables

x^2-2x-4=0

a = 1; b = -2; c = -4;
Δ = b2-4ac
Δ = -22-4·1·(-4)
Δ = 20
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{20}=\sqrt{4*5}=\sqrt{4}*\sqrt{5}=2\sqrt{5}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2\sqrt{5}}{2*1}=\frac{2-2\sqrt{5}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2\sqrt{5}}{2*1}=\frac{2+2\sqrt{5}}{2}
$