y=1/4x^2-9

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Solution for y=1/4x^2-9 equation: 


x in (-oo:+oo)

y = (1/4)*x^2-9 // - (1/4)*x^2-9

y-((1/4)*x^2)+9 = 0

(-1/4)*x^2+y+9 = 0

-1/4*x^2 = -(y+9) // : -1/4

x^2 = 4*(y+9)

x^2 = 4*(y+9) // ^ 1/2

abs(x) = 2*(y+9)^(1/2)

x = 2*(y+9)^(1/2) or x = -(2*(y+9)^(1/2))

x in { 2*(y+9)^(1/2), -(2*(y+9)^(1/2)) }

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