Posted by Shawn on Monday, December 1, 2008 at 2:34pm.
Where appropriate, include the approximation to the nearest tenthousandth.
31.) log(x4)+ log(x+4)= log4
I have the answer as 4
Is this answer right?

Math help  bobpursley, Monday, December 1, 2008 at 2:42pm
log a + log b is same as log ab
so log(x^24)=log4
taking antilogs
x^24=4 solve for 4
check my thinking.

Math help  Shawn, Monday, December 1, 2008 at 2:57pm
Okay x^24 = 4
x^2= 8
sqrt(x^2)= sqrt 8
x= 2.83 is this right?

Math help  Reiny, Monday, December 1, 2008 at 3:04pm
log k has a nasty habit of becoming undefined if k is not positive.
you answer of x = 2.832 is correct according to the steps taken, but...
when we sub into log (x4) we get log (1.168 which is undefined,
so there is no solution in the set of real numbers for your equation
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