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## 'Partitioning Revisited' printed from http://nrich.maths.org/

We can show that $14^2 = 196$ by considering the area of a $14$ by
$14$ square:

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We can show that $(x + 1)^2 = x^2 + 2x + 1$ by considering the area
of an $(x + 1)$ by $(x + 1)$ square:

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Show in a similar way that $(x + 2)^2 = x^2 + 4x + 4$.

Then use the same method to evaluate $(x + 3)^2$ and $(x + a)^2$.