y*(26-y)=0

Solution for y*(26-y)=0 equation:

y(26-y)=0

We add all the numbers together, and all the variables

y(-1y+26)=0

We multiply parentheses

-1y^2+26y=0

a = -1; b = 26; c = 0;
Δ = b2-4ac
Δ = 262-4·(-1)·0
Δ = 676
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{676}=26$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(26)-26}{2*-1}=\frac{-52}{-2}
=+26
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(26)+26}{2*-1}=\frac{0}{-2}
=0
$