6/21-21/x4

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Solution for 6/21-21/x4 equation: 


D( x )

x^4 = 0

x^4 = 0

x^4 = 0

1*x^4 = 0 // : 1

x^4 = 0

x = 0

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

6/21-(21/(x^4)) = 0

6/21-21*x^-4 = 0

-21*x^-4 = -2/7 // : -21

x^-4 = 2/147

-4 < 0

1/(x^4) = 2/147 // * x^4

1 = 2/147*x^4 // : 2/147

147/2 = x^4

x^4 = 147/2 // ^ 1/4

abs(x) = (147/2)^(1/4)

x = (147/2)^(1/4) or x = -(147/2)^(1/4)

x in { (147/2)^(1/4), -(147/2)^(1/4) }

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