A-Math: Spot the Mistake in this Logarithm Equations

I gave my Secondary 4 students 1 revision question per week. The recent one I marked was on the topic of Logarithms (the fresh-killer topic for many Secondary 3).

Logarithm-error

Did you spot the error? (It’s a give-away if you observe clearly)

Do this question and share your answer(s) in the comment section.

I look forward in hearing from you.

Related Posts:

6 Responses to A-Math: Spot the Mistake in this Logarithm Equations
  1. nirosh tharaka
    March 4, 2010 | 5:53 pm

    there is a wrong calculation in divition of logarithm

    Reply

  2. nil
    March 5, 2010 | 2:05 am

    (log2(base2)8)divide by(log2(base2)x)
    is not equal to (log2(base2)8/x)

    (log2(base2)8)-(log2(base2)x)=log2(base2)8/x)

    Reply

  3. AMath Student
    March 5, 2010 | 6:15 pm

    Let log2 x be y.
    2y = 3(log2 2 over log2 x) + 1
    2y – 1 = 3 ( 1 over y )
    2y^2 – y = 3
    2y^2 – y – 3 = 0
    ( 2y – 3 )( y + 1 ) = 0
    2y = 3 , y = -1
    y = 3/2

    If there is a faster method, i would like to know ;)

    Reply

  4. engeline
    March 6, 2010 | 1:10 pm

    1have benefited a lot

    Reply

  5. engeline
    March 6, 2010 | 1:11 pm

    benefited

    Reply

  6. kitty
    March 8, 2010 | 4:38 pm

    Hi where is this tuition centre being held? i just wanna find out whether its very far from my house:)

    Reply

Leave a Reply

Wanting to leave an <em>phasis on your comment?

Trackback URL http://www.singaporeolevelmaths.com/2010/03/04/a-math-spot-the-mistake-in-this-logarithm-equations/trackback/