Cube of Sum

Reference > Algebra: Sums and Differences of Squares and Cubes

Description

The Cube of Sum Rule states that:

\({(a+b)}^{3}={a}^{3}+3{a}^{2}b+3a{b}^{2}+{b}^{3}\)
Examples
\[{x}^{3}+6{x}^{2}+12x+8\]
1
Rewrite it in the form \({a}^{3}+3{a}^{2}b+3a{b}^{2}+{b}^{3}\), where \(a=x\) and \(b=2\).
\[{x}^{3}+3{x}^{2}(2)+3(x)\times {2}^{2}+{2}^{3}\]

2
Use Cube of Sum: \({(a+b)}^{3}={a}^{3}+3{a}^{2}b+3a{b}^{2}+{b}^{3}\).
\[{(x+2)}^{3}\]

Done

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