# Expand (a-b)^{3}.

Expand $$\displaystyle{\left({a}-{b}\right)}^{{{3}}}$$.

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reinosodairyshm
It's easy.
$$\displaystyle{\left({a}-{b}\right)}^{{{3}}}={a}^{{{3}}}+{3}{a}^{{{2}}}{\left(-{b}\right)}+{3}{a}{\left(-{b}\right)}^{{{2}}}+{\left(-{b}\right)}^{{{3}}}={a}^{{{3}}}-{3}{a}^{{{2}}}{b}+{3}{a}{b}^{{{2}}}-{b}^{{{3}}}$$
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Virginia Palmer
$$\displaystyle{\left({a}-{b}\right)}^{{{3}}}={a}^{{{3}}}-{3}{a}^{{{2}}}{b}+{3}{a}{b}^{{{2}}}-{b}^{{{3}}}$$