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Math Help - Basic Algebra Question

  1. #1
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    Basic Algebra Question

    I have a book that teaches the foundations of algebra. I've become stuck on a question: 3a^2 + 2ab + b, when a = 2 and b = 3. The book says the answer is 27. How is that figure derived?

    Thanks!
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  2. #2
    Junior Member alane1994's Avatar
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    Re: Basic Algebra Question

    As an example, I will vary it a little
    3a^3 + 4ab + 2b, when a = 5 and b = 7
    All you do is plug the numbers given into the problem and solve.
    3a^3+4ab+2b
    3(5)^3+4(5)(7)+2(7)
    You just solve it from there.
    =529
    Try it on your own problem.
    Last edited by alane1994; October 10th 2012 at 08:51 AM. Reason: Latex Fixes
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  3. #3
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    Re: Basic Algebra Question

    Hello, MathClown1

    I have a book that teaches the foundations of algebra.
    I've become stuck on a question: . 3a^2 + 2ab + b, when a = 2 and b = 3.

    The book says the answer is 27.
    How is that figure derived?

    It would helpful if you showed your work.

    Then we can see how you got your answer (other than 27).
    And we can point out your error
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  4. #4
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    Re: Basic Algebra Question

    Solved it, thanks! It was done this way: (3x2x2)+(2x2x3)+(3) = 27
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  5. #5
    Junior Member alane1994's Avatar
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    Re: Basic Algebra Question

    Did you get what I said? You just plug the given values into the equation where the given variable is. Rather simple no?
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