3 log 4=a dan 3 log 5=b,maka 4 log 45???

Jawab :
³ log 4 = a
⁴ log 3 = 1/a

b = ³ log 5

1/a ×b = ⁴log 3 × ³log 5 = ⁴ log 5
b/a = ⁴ log 5

⁴log 45
= ⁴log 3²×5
= ⁴log 3² + ⁴log 5
=2 ⁴log 3 + ⁴ log 5
= 2/a + b/a
=( 2+b)/a