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-3(6v-3)+5v=2v(v+6)
We move all terms to the left:
-3(6v-3)+5v-(2v(v+6))=0
We add all the numbers together, and all the variables
5v-3(6v-3)-(2v(v+6))=0
We multiply parentheses
5v-18v-(2v(v+6))+9=0
We calculate terms in parentheses: -(2v(v+6)), so:We add all the numbers together, and all the variables
2v(v+6)
We multiply parentheses
2v^2+12v
Back to the equation:
-(2v^2+12v)
-13v-(2v^2+12v)+9=0
We get rid of parentheses
-2v^2-13v-12v+9=0
We add all the numbers together, and all the variables
-2v^2-25v+9=0
a = -2; b = -25; c = +9;
Δ = b2-4ac
Δ = -252-4·(-2)·9
Δ = 697
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{-(-25)-\sqrt{697}}{2*-2}=\frac{25-\sqrt{697}}{-4} $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-25)+\sqrt{697}}{2*-2}=\frac{25+\sqrt{697}}{-4} $
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