Final answer to the problem
$-\left(-a+1\right)\left(a+1\right)$
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Step-by-step Solution
Specify the solving method
1
Factor the polynomial $\left(-a-1\right)$ by it's greatest common factor (GCF): $-1$
$-\left(-a+1\right)\left(a+1\right)$
Final answer to the problem
$-\left(-a+1\right)\left(a+1\right)$