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4.9x^2+12x-40=0
a = 4.9; b = 12; c = -40;
Δ = b2-4ac
Δ = 122-4·4.9·(-40)
Δ = 928
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{928}=\sqrt{16*58}=\sqrt{16}*\sqrt{58}=4\sqrt{58}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-4\sqrt{58}}{2*4.9}=\frac{-12-4\sqrt{58}}{9.8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+4\sqrt{58}}{2*4.9}=\frac{-12+4\sqrt{58}}{9.8} $
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