Asked by Jus

Show that if
log_b (a) = c, and log_y (b) = c, then log_a (y)=c^-2

Answers

Answered by Reiny
recall
log<sub>b</sub> a = log a/log b (base 10, or any other base for that matter)

so log<sub>b</sub>(a) = loga/logb = c
and log<sub>y</sub>(b) = logb/logy = c

then [loga/logb][logb/logy] = (c)(c) = c^2
so loga/logy = c^2 or
logy/loga = 1/c^2 = c^-2

but logy/loga = log<sub>a</sub>(y)

so log<sub>a</sub>(y) = c^-2 as required.
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