Question

log7.2=?

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Answer 1

$\bf\huge log7.2\\ \\ \sf\ \implies: log72 \times {10}^{ - 1} \\ \\ \sf\ \implies: - 1 + log ( {2}^{2} \times {3}^{2} ) \\ \\ \sf\ \implies: - 1 + 3log2 + 2log3 \\ \\ \sf\ \implies: - 1 + 3 \times 0.30103 + 2 \times 0.47712 \\ \\ \sf\ \implies: - 1 + 0.90309 + 0.95424 \\ \\ \sf\ \implies: - 2 + 1.85733 \\ \\ \sf\boxed{ \implies:0.85733} \\ \\ \\ \\ \\ \bigstar\sf\ \: log2 = 0.30103 \\ \bigstar\sf\ \: log3 = 0.47712 \\ \bigstar\sf\ \: log5 = 0.69897$

Answer 2

log 7.2

=>log 72×10^-1

=>-1+log(2^2+3^2)

=>-1+3log2+2log3

=>-1+3×0.30103+2×0.47712

=>-1+0.90309+0.95424

=>-2+1.85733

=>0.85733