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= log 100
= log 10²
= 2 . log 10
= 2 . 1
= 2
b) log 50 - log 1/2 = log (50 : 1/2)
= log (50 x 2)
= log 100
= log 10²
= 2. log 10
= 2 . 1
= 2
c) - = -
= - - 1
coba cek kembali soal : c
Untuk soal a dan b bisa menggunakan sifat logaritma yaitu log a + log b = log (a.b)
dan log a - log b = log (a : b).
a.log 25 + log 4
= log (25.4)
= log 100
= log 10²
= 2
b.log 50 - log 1/2
= log (50 : 1/2)
= log (50 x 2/1)
= log 100
= log 10²
= 2
c.(x ^ +1) log (X - 1) - (x ^ -1) log (X² - 1)
= x log x : x log 1 - x^-1 log x² : x^-1 log 1
= 1 : 0 - (-2 ) : 0
= 0