(x+2)(x+4)=2x+20

Solution for (x+2)(x+4)=2x+20 equation:

(x+2)(x+4)=2x+20

We move all terms to the left:

(x+2)(x+4)-(2x+20)=0

We get rid of parentheses

(x+2)(x+4)-2x-20=0

We multiply parentheses ..

(+x^2+4x+2x+8)-2x-20=0

We get rid of parentheses

x^2+4x+2x-2x+8-20=0

We add all the numbers together, and all the variables

x^2+4x-12=0

a = 1; b = 4; c = -12;
Δ = b2-4ac
Δ = 42-4·1·(-12)
Δ = 64
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{64}=8$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-8}{2*1}=\frac{-12}{2}
=-6
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+8}{2*1}=\frac{4}{2}
=2
$