4x-16/x

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Solution for 4x-16/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

4*x-(16/x) = 0

4*x-16*x^-1 = 0

4*x^1-16*x^-1 = 0

(4*x^2-16*x^0)/(x^1) = 0 // * x^2

x^1*(4*x^2-16*x^0) = 0

x^1

4*x^2-16 = 0

4*x^2-16 = 0

DELTA = 0^2-(-16*4*4)

DELTA = 256

DELTA > 0

x = (256^(1/2)+0)/(2*4) or x = (0-256^(1/2))/(2*4)

x = 2 or x = -2

x in { -2, 2} 

x in { -2, 2 }

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