Y=1/4x^2-1

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Solution for Y=1/4x^2-1 equation: 


x in (-oo:+oo)

Y = (1/4)*x^2-1 // - (1/4)*x^2-1

Y-((1/4)*x^2)+1 = 0

Y+(-1/4)*x^2+1 = 0

-1/4*x^2 = -(Y+1) // : -1/4

x^2 = 4*(Y+1)

x^2 = 4*(Y+1) // ^ 1/2

abs(x) = 2*(Y+1)^(1/2)

x = 2*(Y+1)^(1/2) or x = -(2*(Y+1)^(1/2))

x in { 2*(Y+1)^(1/2), -(2*(Y+1)^(1/2)) }

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