4 pangkat m-1 + 4 pangkat m = 15 per 4

jawab

4^(m-1) + 4^(m) = 15/4
4 { 4^(m-1) + 4^(m) } = 15
4^m + 4^(m+1) = 15
4^m( 1 + 4) = 15
4^m = 15/5 = 3
log (4^m) = log 3
m. log 4 = log 3
m = ⁴log 3