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x^2-0.21x-2100=0
a = 1; b = -0.21; c = -2100;
Δ = b2-4ac
Δ = -0.212-4·1·(-2100)
Δ = 8400.0441
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{-(-0.21)-\sqrt{8400.0441}}{2*1}=\frac{0.21-\sqrt{8400.0441}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-0.21)+\sqrt{8400.0441}}{2*1}=\frac{0.21+\sqrt{8400.0441}}{2} $
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