Jika 4 log 7 = k, nilai 2 log 49 =

4log7 =k
2^log7=k
1/2 2log7=k
2log7=2k

maka 2log49
=2log7^
=2 2log7
=2 (2k)
=4k

[tex] ^4log7 = k \\ \\ ^2 log49 \\ = ^{\sqrt{4}}log7^2 \\ = ^{4^{\frac{1}{2}}}log7^2 \\ = \frac{2}{\frac{1}{2}} . ^4log7 \\ = 4k [/tex]