Question

expand log15..... fast​

Answer 1

Heya,

Before solving the question, it is worthy to keep these formulas of logarithm in hand .

$log(mn) = log(m) + log(n) \\ \\ log( \frac{m}{n} ) = log(m) - log(n) \\ \\ log( {m}^{n} ) = n log(m) \\ \\ log_{ {m}^{n} }(p) = \frac{1}{n} log_{m}(p)$

$now \\ \\ log(15) = log(3 \times 5) \\ = log(3) + log(5) (using \: property \: 1)$

Regards

Kshitij