Diketahui log 2=0,3010 dan log 7=0,8451 maka log 28=

Kelas 10 Matematika
Bab 1 - Akar, Pangkat dan Logaritma

log 28 = log (4 . 7)
log 28 = log 4 + log 7
log 28 = log 2² + log 7
log 28 = 2 . log 2 + log 7
log 28 = 2 . 0,3010 + 0,8451
log 28 = 0,602 + 0,8451
log 28 = 1,4471

[tex]log 28 = log (7.4)\\ =log7+log4\\ =log7+log 2^{2}\\ =log7+2log2\\ =0,3010+2.0,8451 \\ =1,9912[/tex]