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March 27, 2017

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I'm cubing the binomial (3x+2)^3. THe answer is 54x^2 according to my book, however I got different answers each time. Once I got 74x^2. How do I get 54x^2? I know the order of operations but when I followed it, the boo answer was not the one I got.

  • Algebra - ,

    Pascals Triangle is one way
    1
    11
    121
    1331 which means the coefficents will be
    1(3x)^3 +3(3x)^2*(2)^1 + 3(3x)^1 (2)^2 +2^3

    or

    27x^3 + 54x^2+ 36x+ 8

    The other way is to just multiply it out . I suspect you forgot the 2

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