What's Wrong? Q8(b)

11 comments:

  1. (p-5)^2 = p^2 - 25 NOT p^2+25 .

    ReplyDelete
  2. (3+p)^2 ≠ 9+p^2
    and
    (p-5)^2 ≠ p^2 +25

    ReplyDelete
  3. Im not really to sure, as i am in the opinion that (-5)^2 is still 25

    ReplyDelete
  4. (p-5)^2 is NOT EQUAL TO (p^2 + 25)
    (p-5)^2 = (p-5)(p-5)
    = (p^2-5p-5p+25)
    = (p^2-10p+25)

    So..... this is w®øng

    ReplyDelete
  5. (p-5)^2 = p^2 - 25
    (p-5)^2 ≠ p^2 + 25

    ReplyDelete
  6. when (3+p)^2 is expanded it is (3+p)(3+p) which is 9 + 6p + p^2. and for (p-5)^2 when expanded is (p-5)(p-5) which is p^2 -10p + 25

    ReplyDelete
  7. (p-5)^2 ≠ (p^2 + 25)
    (p-5)^2 = (p-5)(p-5)
    = (p^2-5p-5p+25)
    = (p^2-10p+25)
    Therefore this is wrong. Hey mark, same answer :D

    ReplyDelete
  8. We're not doing single terms only...so don't change the sign

    ReplyDelete
  9. we cannot just power the expression up directly.

    (p-5)^2 = p^2 -25

    NOT p^2 +25

    ReplyDelete
  10. (p-5)^2 ≠p+25
    (p-5)^2= (p+5)(p+5)

    ReplyDelete
  11. (p-5)^2 does not equal p+25. it should equal to (p+5)(p+5)

    ReplyDelete