F(-4)=x^2-1

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Solution for F(-4)=x^2-1 equation: 



(-4)=F^2-1

We move all terms to the left:

(-4)-(F^2-1)=0

We add all the numbers together, and all the variables

-(F^2-1)-4=0

We get rid of parentheses

-F^2+1-4=0

We add all the numbers together, and all the variables

-1F^2-3=0

a = -1; b = 0; c = -3;
Δ = b2-4ac
Δ = 02-4·(-1)·(-3)
Δ = -12
Delta is less than zero, so there is no solution for the equation

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