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evaluate (2a=3)(5a-7)?

2 Answers

  • 1 month ago

    (2a + 3)(5a - 7)

    = 10a^2 + a - 21

  • 1 month ago

    I'm guessing a possible typo here, because the = sign makes little sense. Perhaps it was supposed to be a - sign (one key to the left) or a + sign (same key, but shifted). 


    In case it's either of those, here are the evaluations: 

    (2a-3)(5a-7) = 10a^2 - 15a - 14a + 21 = 10a^2 - 29a + 21 

    [where "a^2" is the usual way around here of writing "a to the power of 2"]. 


    (2a+3)(5a-7) = 10a^2 + 15a - 14a - 21 = 10a^2 + a - 21 


    The expansion method I used is known by the mnemonic F.O.I.L., which stands for 





    in each case describing the product of one possible pair of terms, one from each of the expressions being multiplied. 

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