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6(v-3)v-3=5
We move all terms to the left:
6(v-3)v-3-(5)=0
We add all the numbers together, and all the variables
6(v-3)v-8=0
We multiply parentheses
6v^2-18v-8=0
a = 6; b = -18; c = -8;
Δ = b2-4ac
Δ = -182-4·6·(-8)
Δ = 516
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}$$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{516}=\sqrt{4*129}=\sqrt{4}*\sqrt{129}=2\sqrt{129}$$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-18)-2\sqrt{129}}{2*6}=\frac{18-2\sqrt{129}}{12} $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-18)+2\sqrt{129}}{2*6}=\frac{18+2\sqrt{129}}{12} $
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