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(6v+5)(v+4)=0
We multiply parentheses ..
(+6v^2+24v+5v+20)=0
We get rid of parentheses
6v^2+24v+5v+20=0
We add all the numbers together, and all the variables
6v^2+29v+20=0
a = 6; b = 29; c = +20;
Δ = b2-4ac
Δ = 292-4·6·20
Δ = 361
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{361}=19$$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(29)-19}{2*6}=\frac{-48}{12} =-4 $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(29)+19}{2*6}=\frac{-10}{12} =-5/6 $
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