Thursday, 20 February 2014

Algebra... Help! What's Wrong?

Jane did the following:
  • 3a + b = 3ab
  • 2s + 4t = 6st
Do you think Jane is correct in her algebraic manipulations?
If yes, please write down examples to show that her answer is correct.

If not, explain to Jane her mistakes and help her to correct.

Enter your response in Comments.


  1. No. Because 3a + b is less than 3ab. 3ab is equal to 3 x a and 3 x b.
    The same principle applies to her second algebric statement.

  2. no. the number given have to be a zero pair in order to be put in that way
    correct answers: 1ab +2a
    2st + 2t

  3. No, she is not correct in her algebraic manipulations.
    3ab is 3a x b not 3a+b
    3a+b cannot be expressed as 3ab
    2s+4t is not equal to 6st as 6st means that 6s x t which equals to 6st, not 2s + 4t

  4. 3a+b=3a+b, 3ab=3a x b. 2s+4t=2s+4t, 6st=2sx4t. we do not add the letters and numbers together.

  5. no .3ab is 3 x a x b not 3a + b . 6st is 6 x s x t while

  6. she is wrong as 3AB is 3xAxB and 6ST is 6xsxt