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225b^2-121=0
a = 225; b = 0; c = -121;
Δ = b2-4ac
Δ = 02-4·225·(-121)
Δ = 108900
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{108900}=330$$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-330}{2*225}=\frac{-330}{450} =-11/15 $$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+330}{2*225}=\frac{330}{450} =11/15 $
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