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(2v+v)(5v+9)=0
We add all the numbers together, and all the variables
(+3v)(5v+9)=0
We multiply parentheses ..
(+15v^2+27v)=0
We get rid of parentheses
15v^2+27v=0
a = 15; b = 27; c = 0;
Δ = b2-4ac
Δ = 272-4·15·0
Δ = 729
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{729}=27$$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(27)-27}{2*15}=\frac{-54}{30} =-1+4/5 $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(27)+27}{2*15}=\frac{0}{30} =0 $
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