Jika - Universityku

$log(2) = x \ log(3) = y \ log(7) = z$
Tentukanlah :

A.
$log(15)$
B.
$log( frac{1}{4} )$

TOLONG BANTU KAK

Jika

Jawaban:

$log(5) = log( frac{10}{2} ) \ = log(10) - log(2) \ = 1 - x$

$log(15) = log(3 times 5) \ = log(3) + log(5) \ = y + (1 - x) \ = boxed{1 + y - x}$

$log(40) = log(10 times 2 times 2) \ = log(10) + log(2) + log(2) \ = 1 + 2x$

$log( frac{1}{4} ) = log( frac{10}{40} ) \ = log(10) - log(40) \ = 1 - (1 + 2x) \ = boxed{- 2x}$