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(1v+v)(5v-7)=0
We add all the numbers together, and all the variables
(+2v)(5v-7)=0
We multiply parentheses ..
(+10v^2-14v)=0
We get rid of parentheses
10v^2-14v=0
a = 10; b = -14; c = 0;
Δ = b2-4ac
Δ = -142-4·10·0
Δ = 196
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{196}=14$$v_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-14)-14}{2*10}=\frac{0}{20} =0 $$v_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-14)+14}{2*10}=\frac{28}{20} =1+2/5 $
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