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7x^2+5x-39=0
a = 7; b = 5; c = -39;
Δ = b2-4ac
Δ = 52-4·7·(-39)
Δ = 1117
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{-(5)-\sqrt{1117}}{2*7}=\frac{-5-\sqrt{1117}}{14} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{1117}}{2*7}=\frac{-5+\sqrt{1117}}{14} $
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