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7²+7³=7²(1+7)=7² * 8
=log₇8*7²=log₇8+log₇7²=log₇8+2log₇7=log₇8+2=2+log₇8
Odp. C
(7²+7³) = 7²(1+7) = 7²*8
log₇(7²+7³) = log₇8 + log₇7²
loga a² = 2 loga a, więc:
log₇8 + 2 = 2 + log₇8
myślę, że tak powinno być