F(-3)=3x^2

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



(-3)=3F^2

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3F^2-3=0

a = -3; b = 0; c = -3;
Δ = b2-4ac
Δ = 02-4·(-3)·(-3)
Δ = -36
Delta is less than zero, so there is no solution for the equation

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