# (−1.5)^{11}times (−1.5)

${\left(-1.5\right)}^{11}×\left(-1.5\right)$
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When multiplying powers with the same base, we need to use the Product of Powers Rule which states ${a}^{m}\cdot {a}^{n}={a}^{m}+n$. This rule is stating that we add the exponents and keep the base the same.
Since $\left(-1.5\right)={\left(-1.5\right)}^{1}$, then using the Product of Powers Rule gives:
${\left(-1.5\right)}^{11}×\left(-1.5\right)={\left(-1.5\right)}^{11}\cdot {\left(-1.5\right)}^{1}={\left(-1.5\right)}^{11+1}={\left(-1.5\right)}^{12}$