To solve the equation \( x^3 - 9 = 6 \), we follow these steps:
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Add 9 to both sides to isolate the \( x^3 \) term: \[ x^3 - 9 + 9 = 6 + 9 \] This simplifies to: \[ x^3 = 15 \]
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Take the cube root of both sides to solve for \( x \): \[ x = \sqrt[3]{15} \]
Thus, the solution for \( x \) is: \[ x = \sqrt[3]{15} \]