9u^(-4/5)=1

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Solution for 9u^(-4/5)=1 equation: 


D( u )

u = 0

u = 0

u = 0

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

9*u^(-4/5) = 1 // - 1

9*u^(-4/5)-1 = 0

9*u^(-4/5) = 1 // : 9

u^(-4/5) = 1/9

-4/5 < 0

1/(u^(4/5)) = 1/9 // * u^(4/5)

1 = 1/9*u^(4/5) // : 1/9

9 = u^(4/5)

u^(4/5) = 9 // ^ 5

u^4 = 59049 // ^ 1/4

abs(u) = 9*9^(1/4)

u = 9*9^(1/4) or u = -(9*9^(1/4))

u in { 9*9^(1/4), -(9*9^(1/4)) }

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