20x=1.2x^2

Solution for 20x=1.2x^2 equation:

20x=1.2x^2

We move all terms to the left:

20x-(1.2x^2)=0

We get rid of parentheses

-1.2x^2+20x=0

a = -1.2; b = 20; c = 0;
Δ = b2-4ac
Δ = 202-4·(-1.2)·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*-1.2}=\frac{-40}{-2.4}
=16+1/1.5
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(20)+20}{2*-1.2}=\frac{0}{-2.4}
=0
$