13x^2+-20x+-12=0

Solution for 13x^2+-20x+-12=0 equation:

13x^2+-20x+-12=0

We add all the numbers together, and all the variables

13x^2-20x=0

a = 13; b = -20; c = 0;
Δ = b2-4ac
Δ = -202-4·13·0
Δ = 400
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{400}=20$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-20)-20}{2*13}=\frac{0}{26}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-20)+20}{2*13}=\frac{40}{26}
=1+7/13
$