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3e^2-17e-28=0
a = 3; b = -17; c = -28;
Δ = b2-4ac
Δ = -172-4·3·(-28)
Δ = 625
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$e_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$e_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{625}=25$$e_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-25}{2*3}=\frac{-8}{6} =-1+1/3 $$e_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+25}{2*3}=\frac{42}{6} =7 $
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