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Formula use:
a^3-b^3=\left(a-b\right)\left(a^2+ab+b^2\right)
Given expression is: a^3-{8b}^3
Factorize
a^3-{8b}^3
\rightarrow\left(a\right)^3-\left(2b\right)^3
\rightarrow\left(a-2b\right)\left(a^2-a.2b+4b^2\right)
\therefore\left(a-2b\right)\left(a^2+2ab+4b^2\right)
Ans: \left(a-2b\right)\left(a^2+2ab+4b^2\right)
