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7v^2-5v-6=0
a = 7; b = -5; c = -6;
Δ = b2-4ac
Δ = -52-4·7·(-6)
Δ = 193
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-5)-\sqrt{193}}{2*7}=\frac{5-\sqrt{193}}{14} $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{193}}{2*7}=\frac{5+\sqrt{193}}{14} $
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