(x+7/x)*(6/3x+21)

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Solution for (x+7/x)*(6/3x+21) equation: 


D( x )

x = 0

x = 0

x = 0

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

(x+7/x)*((6/3)*x+21) = 0

(x+7*x^-1)*(2*x+21) = 0

x+7*x^-1 = 0

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

1*x^2 = -7 // : 1

x^2 = -7

1/x = 0

x^-1*(2*x+21) = 0

( 2*x+21 )

2*x+21 = 0 // - 21

2*x = -21 // : 2

x = -21/2

( x^-1 )

1*x^-1 = 0 // : 1

x^-1 = 0

x naleu017Cy do O

x = -21/2

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