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18y-y^2=0
We add all the numbers together, and all the variables
-1y^2+18y=0
a = -1; b = 18; c = 0;
Δ = b2-4ac
Δ = 182-4·(-1)·0
Δ = 324
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{324}=18$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(18)-18}{2*-1}=\frac{-36}{-2} =+18 $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(18)+18}{2*-1}=\frac{0}{-2} =0 $
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