81=2x^2/8

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Solution for 81=2x^2/8 equation: 


x in (-oo:+oo)

81 = (2*x^2)/8 // - (2*x^2)/8

81-((2*x^2)/8) = 0

(-1/4)*x^2+81 = 0

-1/4*x^2 = -81 // : -1/4

x^2 = 324

x^2 = 324 // ^ 1/2

abs(x) = 18

x = 18 or x = -18

x in { 18, -18 }

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