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26 April, 04:17

Which factorization is incorrect?

1) 4k^2-49 = (2k+7) (2k-7)

2) a^3-8b^3 = (a-2b) (a^2+2ab+4b^2)

3) m^3+3m^2-4m+12 = (m-2) ^2 (m+3)

4) t^3+5t^2+6t+t^2+5t+6 = (t+1) (t+2) (t+3)

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Answers (1)
  1. 26 April, 07:40
    0
    The answer is 3)

    Just sub any number you want into the equation and calculate it.

    For example of 3)

    When m=1

    Left hand size=1+3-4+12=12

    Right hand size=-1x4=-4

    Left hand size≠Right hand size

    It is incorrect.
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