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April 17, 2014

April 17, 2014

Posted by **phyllys** on Tuesday, January 1, 2013 at 9:02pm.

log 3(x+4) = 2+log3(x-20)

the 3 in the part of log (3)should be lower just didn't know how to type it in here

- Pre-Cal -
**Reiny**, Tuesday, January 1, 2013 at 10:40pmlog3 (x+4) - log3 (x-20) = 2 , where clearly x > 20

log3 ( (x+4)/(x-20) ) = 2

(x+4)/(x-20) = 3^2 = 9

9x - 180 = x+4

8x = 184

x = 23

check:

LS = log3 27 = 3

RS = 2 + log3 3

= 2 + 1 = 3 = LS

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