13+2x(x-6)=4x-7

Solution for 13+2x(x-6)=4x-7 equation:

13+2x(x-6)=4x-7

We move all terms to the left:

13+2x(x-6)-(4x-7)=0

We multiply parentheses

2x^2-12x-(4x-7)+13=0

We get rid of parentheses

2x^2-12x-4x+7+13=0

We add all the numbers together, and all the variables

2x^2-16x+20=0

a = 2; b = -16; c = +20;
Δ = b2-4ac
Δ = -162-4·2·20
Δ = 96
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:

$\sqrt{\Delta}=\sqrt{96}=\sqrt{16*6}=\sqrt{16}*\sqrt{6}=4\sqrt{6}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-16)-4\sqrt{6}}{2*2}=\frac{16-4\sqrt{6}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-16)+4\sqrt{6}}{2*2}=\frac{16+4\sqrt{6}}{4}
$