Final Answer
$x^2a^2-a^2$
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Step-by-step Solution
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1
The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: $(a+b)(a-b)=a^2-b^2$.
$\left(x^2-1\right)a^2$
2
Multiply the single term $a^2$ by each term of the polynomial $\left(x^2-1\right)$
$x^2a^2-a^2$
Final Answer
$x^2a^2-a^2$