What's Wrong? Q9(b) v2

13 comments:

  1. Transfer error at line 3

    ReplyDelete
  2. Transfer error. 12a^2 become 2a^2. I make this kind of mistakes too.

    ReplyDelete
  3. (2a + 1)^2 IS NOT equal to (4a^2+1) !!!!
    (2a + 1)^2 is (2a + 1)(2a + 1)
    = 2a(2a+1) + 1(2a + 1)
    = 4a^2 + 2a + 2a + 1
    = 4a^2 + 4a + 1

    ReplyDelete
  4. The person did not use the foil or prove to expand (2a+1)^2 so the answer derived is wrong.The person transferred 12a^2 wrongly at the third line.

    ReplyDelete
  5. He/she transferred wrongly, from 12a^2 into 2a^2.

    ReplyDelete
  6. Mistake of the week.

    12a, he changed to 2a.

    Owen here.

    ReplyDelete
  7. -2a instead of 12a and btw, i think it might be me -.-

    ReplyDelete
  8. (2a+1)^2 ≠ (4a^2+1)
    Transfer error , should be 12a not 2a .

    ReplyDelete
  9. He/she changed 12a into 2a. .________________>...

    And (2a+1)^2≠(4a^2+1). ._____.
    its 4a^2+4a+1.

    The name's Ishani.

    ReplyDelete
  10. (2a + 1) ^2 ≠ (4a^2 +1)

    It is (2a + 1) (2a +1)
    = 4a^2 + 4a + 1

    ReplyDelete
  11. There was a transfer error

    ReplyDelete