What is the log of 42 base 7?

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2007-05-17 14:05:36 · 4 answers · asked by ? 1 in Science & Mathematics ➔ Mathematics

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2007-05-17 14:08:14 · answer #1 · answered by vannunu4 3 · 0⤊ 0⤋

log(42) base 7 = log(7*6) base 7

log(ab) = log(a) + log(b)

log 7 base 7 + log 6 base 7 = 1 + log 6 base 7

2007-05-17 21:13:34 · answer #2 · answered by Astral Walker 7 · 0⤊ 0⤋

Think!

What power do you have to raise 7 to, to get 42?
Use the identities to figure it out - like this:

42log7=log42/log7

2007-05-17 21:09:20 · answer #3 · answered by tkquestion 7 · 0⤊ 0⤋

log_7 42=ln 42 /ln 7=1.920782221161601790318727245

2007-05-17 21:09:21 · answer #4 · answered by yupchagee 7 · 1⤊ 0⤋