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This is partly a laws of exponents problem. We need to distribute the x to both terms inside the parenthesis.
Let's split this into two part.
x * x^2 (since they have the same base,and they are multiplied: you add the exponents)
x * -9y^2 (notice that there are not any common basis, thus we multiply the whole thing by x as follows)
Combine these two things together.
Thus our answer is x^3-9xy^2.
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