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-4.9x^2-1.8x+60=0
a = -4.9; b = -1.8; c = +60;
Δ = b2-4ac
Δ = -1.82-4·(-4.9)·60
Δ = 1179.24
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{-(-1.8)-\sqrt{1179.24}}{2*-4.9}=\frac{1.8-\sqrt{1179.24}}{-9.8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1.8)+\sqrt{1179.24}}{2*-4.9}=\frac{1.8+\sqrt{1179.24}}{-9.8} $
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