(9-z)z

Multiply and simplify

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To multiply the polynomial, we have to distribute.

When distributing, you multiply whatever is outside of the parentheses by everything inside the parentheses.

So, z(9-z) means to multiply "z" by everything inside the parentheses.

We multiply z times 9, and then we multiply z times -z.

We then get 9z- z^2.

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