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=Y2-225

We move all terms to the left:

-(Y2-225)=0

We add all the numbers together, and all the variables

-(+Y^2-225)=0

We get rid of parentheses

-Y^2+225=0

We add all the numbers together, and all the variables

-1Y^2+225=0

a = -1; b = 0; c = +225;

Δ = b^{2}-4ac

Δ = 0^{2}-4·(-1)·225

Δ = 900

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{900}=30$$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-30}{2*-1}=\frac{-30}{-2} =+15 $$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+30}{2*-1}=\frac{30}{-2} =-15 $

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