4=-5v2+4v

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Solution for 4=-5v2+4v equation: 



4=-5v^2+4v

We move all terms to the left:

4-(-5v^2+4v)=0

We get rid of parentheses

5v^2-4v+4=0

a = 5; b = -4; c = +4;
Δ = b2-4ac
Δ = -42-4·5·4
Δ = -64
Delta is less than zero, so there is no solution for the equation

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