Using $(x + a) (x + b) = x^{2} + (a + b) x + a b,$ find $5.1 * 5.2$

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Solution

$5.1 \times 5.2$
$= (5 + 0.1) \times (5 + 0.2)$
$= 5^{2} + 5 (0.1 + 0.2) + 0.1 \times 0.2$
$= 25 + 1.5 + 0.02$
$= 26.52$

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