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-0.004x^2+x-10=0
a = -0.004; b = 1; c = -10;
Δ = b2-4ac
Δ = 12-4·(-0.004)·(-10)
Δ = 0.84
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)-\sqrt{0.84}}{2*-0.004}=\frac{-1-\sqrt{0.84}}{-0.008} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{0.84}}{2*-0.004}=\frac{-1+\sqrt{0.84}}{-0.008} $
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