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x^2-1-2.1x=0
a = 1; b = -2.1; c = -1;
Δ = b2-4ac
Δ = -2.12-4·1·(-1)
Δ = 8.41
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{-(-2.1)-\sqrt{8.41}}{2*1}=\frac{2.1-\sqrt{8.41}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2.1)+\sqrt{8.41}}{2*1}=\frac{2.1+\sqrt{8.41}}{2} $
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