Homework Help: pre calculus

Posted by James on Saturday, December 17, 2011 at 9:16pm.

Use properties of logarithms to find the exact value of the expression
log_7 (343 * 7^15)

pre calculus - Reiny, Saturday, December 17, 2011 at 10:49pm
log₇ (343*7^15)
= log₇ 343 + log₇ 7^15
= log₇ 7^3 + 15log₇7
= 3log₇7 + 15log₇7
= 3(1) + 15(1)
= 18

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