Question
Expand: $\Big(1+\frac{2}{3}{\text{a}}\Big)^3$
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Answer
$\Big(1+\frac{2}{3}{\text{a}}\Big)^3$ $=\Big(\frac{2}{3}\text{a}\Big)^3+3\times\Big(\frac{2}{3}\text{a}\Big)^2\times1+3\text{a}\frac{2}{3}\text{a}\times(1)^2+(1)^3$ $=\frac{8}{27}\text{a}^3+\frac{4}{3}\text{a}^2+2\text{a}+1$
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