tolong Tulis caranya yahhh

7log4.2log5 + 7log(49/25)
→ 7log2^2.2log5 + 7log49 - 7log25
→ 2.7log2.2log5 + 7log7^2 - 7log5^2
→ 2.7log5 + 2.7log7 - 2.7log5
→ 2.7log5 + 2- 2.7log5
→ 2.7log5 - 2.7log5 + 2
→ 0 +2 = 2