if √(6x - 9)=x, what is the value of xxx ?

Question

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Answer 1

square both sides and you have 6x-9=x^2

x^2 -6x + 9= 0

(x-3)(x-3)=0 so x=3

therefore x^3= 3^3=27

Answer 2

x³ = (6x - 9)√(6x - 9)