F(-7)=3x2

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Solution for F(-7)=3x2 equation: 



(-7)=3F^2

We move all terms to the left:

(-7)-(3F^2)=0

We add all the numbers together, and all the variables

-3F^2-7=0

a = -3; b = 0; c = -7;
Δ = b2-4ac
Δ = 02-4·(-3)·(-7)
Δ = -84
Delta is less than zero, so there is no solution for the equation

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