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(a + b)^2 Expansion and Visualisation

Using identit...

Question

Using identities evaluate ${(3.1)}^{2}$

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Solution

${3.1}^{2} = (3 + 0.1)^{2} = 3^{2} + {0.1}^{2} + 2 \times 3 \times 0.1$
$= 9 + 0.01 + 0.6$
$= 9.61$

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