15y=3y*5y

Solution for 15y=3y*5y equation:

15y=3y*5y

We move all terms to the left:

15y-(3y*5y)=0

We add all the numbers together, and all the variables

15y-(+3y*5y)=0

We get rid of parentheses

15y-3y*5y=0

Wy multiply elements

-15y^2+15y=0

a = -15; b = 15; c = 0;
Δ = b2-4ac
Δ = 152-4·(-15)·0
Δ = 225
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{225}=15$
$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(15)-15}{2*-15}=\frac{-30}{-30}
=1
$
$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+15}{2*-15}=\frac{0}{-30}
=0
$