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2.9x^2-6x-7.5=0
a = 2.9; b = -6; c = -7.5;
Δ = b2-4ac
Δ = -62-4·2.9·(-7.5)
Δ = 123
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{-(-6)-\sqrt{123}}{2*2.9}=\frac{6-\sqrt{123}}{5.8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+\sqrt{123}}{2*2.9}=\frac{6+\sqrt{123}}{5.8} $
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