Math

2. what is the product of -8 and -7?
A 56
B -56
C 63***
D -63

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  1. no, 63 = -9 * -7
    Time to review your multiplication tables.
    Or maybe, I don't know, pull out your calculator ...

    The only trick here is remembering that the product of two negatives is a positive, but you seem to have gotten that right ... unless you just guessed.

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    oobleck
  2. - 8 = ( - 1 ) ∙ 8

    - 7 = ( - 1 ) ∙ 7

    ( - 8 ) ∙ ( - 7 ) = ( - 1 ) ∙ 8 ∙ ( - 1 ) ∙ 7 = ( - 1 ) ∙ ( - 1 ) ∙ 8 ∙ 7 = 1 ∙ 56 = 56

    ____________________

    Remark:

    ( - 1 ) ∙ ( - 1 ) = ( - 1 )² = 1
    ____________________

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