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Math Help - ok, how do you know when to group these?

  1. #1
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    ok, how do you know when to group these?

    ok thanks to mr fantastic i know pretty much how to work these problems but there is still one small area im being confused with however

    for example, if the problem was like this

    3q^2 + 14q + 11

    i'd then need a set of integers that's sum is 14 and product is 33

    the answer to that is 3 and 11.

    which one comes first though when you bring the problem down? How do you know which one comes first? for example would you group 11 or 3 with 3q^2?

    thanks
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  2. #2
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    Quote Originally Posted by formex View Post
    ok thanks to mr fantastic i know pretty much how to work these problems but there is still one small area im being confused with however

    for example, if the problem was like this

    3q^2 + 14q + 11

    i'd then need a set of integers that's sum is 14 and product is 33

    the answer to that is 3 and 11.

    which one comes first though when you bring the problem down? How do you know which one comes first? for example would you group 11 or 3 with 3q^2?

    thanks
    3q^2 + 3q + 11q + 11 = 3q(q + 1) + 11 (q + 1) = (q + 1)(3q + 11).

    3q^2 + 11q + 3q + 11 = q(3q + 11) + 1(3q + 11) = (3q + 11)(q + 1).

    Do you think it matters which one comes first ....?
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  3. #3
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    Quote Originally Posted by mr fantastic View Post
    3q^2 + 3q + 11q + 11 = 3q(q + 1) + 11 (q + 1) = (q + 1)(3q + 11).

    3q^2 + 11q + 3q + 11 = q(3q + 11) + 1(3q + 11) = (3q + 11)(q + 1).

    Do you think it matters which one comes first ....?
    hmm guess it doesn't. the 2nd formula i had wrong where you put q as the divisor i couldnt find anything to go as the divisor but i get it now
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