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X^2+0.30X-70=0
a = 1; b = 0.30; c = -70;
Δ = b2-4ac
Δ = 0.302-4·1·(-70)
Δ = 280.09
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{-(0.30)-\sqrt{280.09}}{2*1}=\frac{-0.3-\sqrt{280.09}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.30)+\sqrt{280.09}}{2*1}=\frac{-0.3+\sqrt{280.09}}{2} $
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