Work Step by Step
With $8=2^3$, the given polynomial is equivalent to: $=2^3-a^3$ Factor using the formula $x^3-y^3=(x-y)(x^2+xy+y^2)$ with $x=2$ and $y=a$ to obtain: $=(2-a)(2^2+2\cdot a + a^2) \\=(2-a)(4+2a+a^2)$
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