0=4x^2-0.63x

Solution for 0=4x^2-0.63x equation:

0=4x^2-0.63x

We move all terms to the left:

0-(4x^2-0.63x)=0

We add all the numbers together, and all the variables

-(4x^2-0.63x)=0

We get rid of parentheses

-4x^2+0.63x=0

a = -4; b = 0.63; c = 0;
Δ = b2-4ac
Δ = 0.632-4·(-4)·0
Δ = 0.3969
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0.63)-\sqrt{0.3969}}{2*-4}=\frac{-0.63-\sqrt{0.3969}}{-8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.63)+\sqrt{0.3969}}{2*-4}=\frac{-0.63+\sqrt{0.3969}}{-8}
$