Using identities, evaluate:
${8.9}^{2}$

$64.81$

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$79.21$

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$80.21$

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$79.31$

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Solution

The correct option is B
$79.21$

${8.9}^{2} = (8 + 0.9)^{2} = (8)^{2} + 2 \times 8 \times 0.9 + (0.9)^{2}$
$[U s i n g i d e n t i t y (a + b)^{2} = a^{2} + 2 a b + b^{2}]$
$= 64 + 14.4 + 0.81 = 79.21$

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