7x^(9/4)-21=0

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Solution for 7x^(9/4)-21=0 equation: 


D( x )

x < 0

x < 0

x in <0:+oo)

7*x^(9/4)-21 = 0

7*x^(9/4) = 21 // : 7

x^(9/4) = 3

x^(9/4) = 3 // ^ 4

x^9 = 81 // ^ 1/9

x = 81^(1/9)

x = 81^(1/9)

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