4x^2-24x+36=20

Solution for 4x^2-24x+36=20 equation:

4x^2-24x+36=20

We move all terms to the left:

4x^2-24x+36-(20)=0

We add all the numbers together, and all the variables

4x^2-24x+16=0

a = 4; b = -24; c = +16;
Δ = b2-4ac
Δ = -242-4·4·16
Δ = 320
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:

$\sqrt{\Delta}=\sqrt{320}=\sqrt{64*5}=\sqrt{64}*\sqrt{5}=8\sqrt{5}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-24)-8\sqrt{5}}{2*4}=\frac{24-8\sqrt{5}}{8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-24)+8\sqrt{5}}{2*4}=\frac{24+8\sqrt{5}}{8}
$