Monday

September 22, 2014

September 22, 2014

Posted by **Sabrina** on Wednesday, January 5, 2011 at 9:52pm.

2log(x-1) =log(x+1)

2 (x-1)=(x+1)

x=3

Please help :)

- Math -
**MathMate**, Wednesday, January 5, 2011 at 10:00pm - Math -
**Reiny**, Wednesday, January 5, 2011 at 11:02pmSome mathteacher published a book some time ago listing all the silly solutions that students had produced.

It actually had it this way

2log(x-1) =log(x+1)

(2log(x-1))**/log**= (log(x+1))**/log**, then the log/log canceled

2(x-1) = (x+1)

2x - 2 = x+1

x = 3, which by sheer coincidence is the right answer.

- Math -
**MathMate**, Thursday, January 6, 2011 at 7:22amMy teacher showed us this one:

64/16

= (6)4/1(6) [cancel the 6]

= 4/1

= 4

gets the right answer, but the wrong way.

**Answer this Question**

**Related Questions**

Precalculus - What am I doing wrong? I keep getting 48 and its wrong... Solve ...

LOGARITHMS - HI THE QUESTION STATES THAT ONE SHOULD CALCULATE THE LOGS WITHOUT ...

Math - solve log(7x-3)+2log(5)=2+log(x+3) I've attempted to do this question ...

Math - Express as a single logarithm. 1/2log(subscript)3 144-log(subscript)3 4+...

Logarithms - Hi, Can anyone tell me if the following are correct please:- If x...

Math - Are all statements that are true. (a) log(A)/log(B)=In(A)/In(B) (b) In ...

Math - Are all statements that are true. (a) log(A)/log(B)=In(A)/In(B) (b) In ...

math - which three statements are true? a) if x= -10^4 then log 10 = -4 b)if x= ...

mathematics -logs - which three statements are true? a) if x= -10^4 then log 10...

math - Q1:solve log(5)x-log(25)(x+10) = 0.5 Q2:If 2log(a)x=1+log(a) (7x-10a) ,...