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4.905x^2-13x-87=0
a = 4.905; b = -13; c = -87;
Δ = b2-4ac
Δ = -132-4·4.905·(-87)
Δ = 1875.94
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{-(-13)-\sqrt{1875.94}}{2*4.905}=\frac{13-\sqrt{1875.94}}{9.81} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-13)+\sqrt{1875.94}}{2*4.905}=\frac{13+\sqrt{1875.94}}{9.81} $
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