9=1/4x^2

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


x in (-oo:+oo)

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

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

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

-1/4*x^2 = -9 // : -1/4

x^2 = 36

x^2 = 36 // ^ 1/2

abs(x) = 6

x = 6 or x = -6

x in { 6, -6 }

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