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D( x )
6*x^2-15 = 0
6*x^2-15 = 0
6*x^2-15 = 0
6*x^2 = 15 // : 6
x^2 = 5/2
x^2 = 5/2 // ^ 1/2
abs(x) = (5/2)^(1/2)
x = (5/2)^(1/2) or x = -(5/2)^(1/2)
x in (-oo:-(5/2)^(1/2)) U (-(5/2)^(1/2):(5/2)^(1/2)) U ((5/2)^(1/2):+oo)
(27*x+14)/(6*x^2-15) = 0
27*x+14 = 0 // - 14
27*x = -14 // : 27
x = -14/27
x = -14/27
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