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4.905x^2-21x+13=0
a = 4.905; b = -21; c = +13;
Δ = b2-4ac
Δ = -212-4·4.905·13
Δ = 185.94
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{-(-21)-\sqrt{185.94}}{2*4.905}=\frac{21-\sqrt{185.94}}{9.81} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+\sqrt{185.94}}{2*4.905}=\frac{21+\sqrt{185.94}}{9.81} $
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