Exercise27

Evaluate the following expressions.

  1. Evaluate \({\left(-3r\right)^{2}}\) when \(r=-1\text{.}\) \(\displaystyle{{\left(-3r\right)^{2}}=}\)

  2. Evaluate \({\left(-3r\right)^{3}}\) when \(r=-1\text{.}\) \(\displaystyle{{\left(-3r\right)^{3}}=}\)

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