F(4)=-4x^2+3x

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Solution for F(4)=-4x^2+3x equation: 



(4)=-4F^2+3F

We move all terms to the left:

(4)-(-4F^2+3F)=0

We get rid of parentheses

4F^2-3F+4=0

a = 4; b = -3; c = +4;
Δ = b2-4ac
Δ = -32-4·4·4
Δ = -55
Delta is less than zero, so there is no solution for the equation

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