document.write( "Question 845417: Suppose that log base 7 3=a, find log base 7 63.
\n" ); document.write( "The answer is 2a+1, and I don't know why. \n" ); document.write( "

Algebra.Com's Answer #509278 by Fombitz(32388) $\"\"$ $\"About$

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$\"log%287%2C3%29=a\"$ means $\"7%5E%28a%29=3\"$
\n" ); document.write( " $\"7%5E%28b%29=63\"$
\n" ); document.write( " $\"7%5E%28b%29=3%2A3%2A7\"$
\n" ); document.write( " $\"7%5E%28b%29=7%5E%28a%29%2A7%5E%28a%29%2A7\"$
\n" ); document.write( " $\"7%5E%28b%29=7%5E%282a%2B1%29\"$
\n" ); document.write( "So then
\n" ); document.write( " $\"log%287%2C63%29=2a%2B1\"$
\n" ); document.write( " \n" ); document.write( "

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