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y^2-6y-891=0
a = 1; b = -6; c = -891;
Δ = b2-4ac
Δ = -62-4·1·(-891)
Δ = 3600
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{3600}=60$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-60}{2*1}=\frac{-54}{2} =-27 $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+60}{2*1}=\frac{66}{2} =33 $
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