x=3,14x^2

Solution for x=3,14x^2 equation:

x=3.14x^2

We move all terms to the left:

x-(3.14x^2)=0

We get rid of parentheses

-3.14x^2+x=0

a = -3.14; b = 1; c = 0;
Δ = b2-4ac
Δ = 12-4·(-3.14)·0
Δ = 1
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1}=1$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-1}{2*-3.14}=\frac{-2}{-6.28}
=1/3.14
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+1}{2*-3.14}=\frac{0}{-6.28}
=0
$