Logb121=2 Can somebody help and explain?

asked Jul 24, 2015 115k views

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Logb121=2
Can somebody help and explain?

by Gotti

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3 votes

$log_b 121=2 \\ log_b 11^2=2 \\ 2log_b11=2 \\ log_b11=1$
therefore b=11

Kiwi answered Jul 26, 2015

by Kiwi

8.1k points

2 votes

$log_b121=2\iff b^2=121\to b=√(121)\to b=11\\\\b > 0\ \wedge\ b\\eq1\\\\\\\log_ab=c\iff a^c=b$

KBP answered Jul 31, 2015

by KBP

8.1k points

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