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-16x^2+81x-88=0
a = -16; b = 81; c = -88;
Δ = b2-4ac
Δ = 812-4·(-16)·(-88)
Δ = 929
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(81)-\sqrt{929}}{2*-16}=\frac{-81-\sqrt{929}}{-32} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(81)+\sqrt{929}}{2*-16}=\frac{-81+\sqrt{929}}{-32} $
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