3/4x^2-15

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Solution for 3/4x^2-15 equation: 


x in (-oo:+oo)

(3/4)*x^2-15 = 0

3/4*x^2 = 15 // : 3/4

x^2 = 20

x^2 = 20 // ^ 1/2

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

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

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

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