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4.9x^2+9x+1.2=0
a = 4.9; b = 9; c = +1.2;
Δ = b2-4ac
Δ = 92-4·4.9·1.2
Δ = 57.48
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{-(9)-\sqrt{57.48}}{2*4.9}=\frac{-9-\sqrt{57.48}}{9.8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+\sqrt{57.48}}{2*4.9}=\frac{-9+\sqrt{57.48}}{9.8} $
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