K(-3)=4x^2-1

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Solution for K(-3)=4x^2-1 equation: 



(-3)=4K^2-1

We move all terms to the left:

(-3)-(4K^2-1)=0

We add all the numbers together, and all the variables

-(4K^2-1)-3=0

We get rid of parentheses

-4K^2+1-3=0

We add all the numbers together, and all the variables

-4K^2-2=0

a = -4; b = 0; c = -2;
Δ = b2-4ac
Δ = 02-4·(-4)·(-2)
Δ = -32
Delta is less than zero, so there is no solution for the equation

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