6.3y=y*y

Solution for 6.3y=y*y equation:

6.3y=y*y

We move all terms to the left:

6.3y-(y*y)=0

We add all the numbers together, and all the variables

6.3y-(+y*y)=0

We get rid of parentheses

6.3y-y*y=0

Wy multiply elements

-1y^2+6.3y=0

a = -1; b = 6.3; c = 0;
Δ = b2-4ac
Δ = 6.32-4·(-1)·0
Δ = 39.69
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6.3)-\sqrt{39.69}}{2*-1}=\frac{-6.3-\sqrt{39.69}}{-2}
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6.3)+\sqrt{39.69}}{2*-1}=\frac{-6.3+\sqrt{39.69}}{-2}
$