4x-7/x

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Solution for 4x-7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4*x-(7/x) = 0

4*x-7*x^-1 = 0

4*x^1-7*x^-1 = 0

(4*x^2-7*x^0)/(x^1) = 0 // * x^2

x^1*(4*x^2-7*x^0) = 0

x^1

4*x^2-7 = 0

4*x^2-7 = 0

DELTA = 0^2-(-7*4*4)

DELTA = 112

DELTA > 0

x = (112^(1/2)+0)/(2*4) or x = (0-112^(1/2))/(2*4)

x = (1*7^(1/2))/2 or x = (-7^(1/2))/2

x in { (-7^(1/2))/2, (1*7^(1/2))/2} 

x in { (-7^(1/2))/2, (1*7^(1/2))/2 }

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