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Math Help - Help with multiplying exponents

  1. #1
    Junior Member
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    Help with multiplying exponents

    I have these 3 problems I'm struggling on.
    The first:
    (2y^3)(7x^2)(2y^4)

    and

    -m^2(4r^3)(12r^4)(5m)

    and a word problem
    Each side of a cube has a length given by the expression 3x^3 find the volume.

    Can you guys show me how to set it up and do the problems step by step?
    Thanks for your help!
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  2. #2
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    In the case of the first question when you are multiplying terms you simply add the exponents provided the variables are the same. In your case the x term will stay the same but you are able to combine the y terms. However the coefficients are multiplied together just like normal numbers.

     2y^3 * 7x^2 * 2y^4
     = 28x^2y^7

    The second question is delt with in the same way as the first.

    For the final question  V = l*b*h
    So  V = 3x^3 * 3x^3 *3x^3

    I'll let you work the other two questions out yourself because it's better for you to do them to make sure you understand. Hopefully I've explained well enough but if you need further help just ask. Feel free to post your answers and I'll check you've done the right thing if you like.
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  3. #3
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    Thank you!

    Now for this equation -m^2(4r^3)(12r^4)(5m)
    I got -240m^3r^7 is that right?
    Last edited by Jubbly; February 25th 2009 at 06:11 PM.
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  4. #4
    MHF Contributor
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    Quote Originally Posted by Jubbly View Post
    Thank you!

    Now for this equation -m^2(4r^3)(12r^4)(5m)
    I got -240m^3r^7 is that right?

    yes you are right .
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