i need help solving this: x^(2/3)-2x^(1/3)=15. And the intrsutions say explain and demonstrate how to use substitution to solve the equation. well i don't understand this at all. please help!

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treat x^(2/3) as x^(1/3)^2

ok put
\[z=x^{\frac{1}{3}}\]

then factor as x^2-2x-15=0, and substitute x^1/3 back in for x

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