1/3x2-4=21

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Solution for 1/3x2-4=21 equation: 


x in (-oo:+oo)

(1/3)*x^2-4 = 21 // - 21

(1/3)*x^2-21-4 = 0

1/3*x^2 = 25 // : 1/3

x^2 = 75

x^2 = 75 // ^ 1/2

abs(x) = 5*3^(1/2)

x = 5*3^(1/2) or x = -(5*3^(1/2))

x in { 5*3^(1/2), -(5*3^(1/2)) }

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