Question 6(v)
Using identities, evaluate:
${5.2}^{2}$

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Solution

${5.2}^{2} = (5 + 0.2)^{2} = (5)^{2} + 2 \times 5 \times 0.2 + (0.2)^{2}$
$[U s i n g i d e n t i t y (a + b)^{2} = a^{2} + 2 a b + b^{2}]$
$= 25 + 2.0 + 0.04 = 27.04$

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