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7v^2+9v+2=0
a = 7; b = 9; c = +2;
Δ = b2-4ac
Δ = 92-4·7·2
Δ = 25
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}$$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{25}=5$$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(9)-5}{2*7}=\frac{-14}{14} =-1 $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(9)+5}{2*7}=\frac{-4}{14} =-2/7 $
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