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

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



(-4)=4F^2-F

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-4F^2+F-4=0

a = -4; b = 1; c = -4;
Δ = b2-4ac
Δ = 12-4·(-4)·(-4)
Δ = -63
Delta is less than zero, so there is no solution for the equation

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