CPM Homework Help : CCA2 Problem 10-103

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10-103.

Use the properties of logarithms to rewrite each equation and then solve. Check for extraneous roots.

Hint:

See the homework help for problem 10-95.

log $(x) +$ log $(x + 21) = 2$
Answer (a):
$x = 4$

$2$ log $_4(x) -$ log $_4(3) = 2$

log $_2(9x + 5) -$ log $_2(x^2 - 1) = 2$
Answer (c):
$x = 3$

log $_7(x + 1) +$ log $_7(x - 5) = 1$

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