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225=a2

We move all terms to the left:

225-(a2)=0

We add all the numbers together, and all the variables

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

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