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Math Help - Grade 9 Algebra help

  1. #1
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    Grade 9 Algebra help

    Hi, all!
    I have exams coming up soon and I'm just going through my textbook and practising a few past exam papers and I have this which I need help on.

    a) 2(-3a2b)2

    b) 2bn x 23bThanks in advance!!!!!
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  2. #2
    MHF Contributor Reckoner's Avatar
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    Re: Grade 9 Algebra help

    Quote Originally Posted by JesseElFantasma View Post
    a) 2(-3a2b)2

    b) 2bn x 23
    It would be helpful to know what you want to do with these expressions. Are you being asked to simplify them? If so, apply the following properties of exponents:

    a^ma^n = a^{m+n}

    \frac{a^m}{a^n} = a^{m-n}

    (ab)^n = a^nb^n

    \left(\frac ab\right)^n = \frac{a^n}{b^n}
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  3. #3
    Junior Member Sarasij's Avatar
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    Re: Grade 9 Algebra help

    a) 2(-3a2b)2=2 x (-3)2 x (a2)2 x (b)2 = 2 x 9 x a4 x b2 = 18a4b2

    b)2bn x 23b = 2 x 23 x bn x b = 24 x bn+1 = 16bn+1

    anyways I would always say to practice these sorts of exercises with the formulas that Reckoner gave here.
    Last edited by Sarasij; June 6th 2012 at 09:14 AM.
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  4. #4
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    Re: Grade 9 Algebra help

    Quote Originally Posted by JesseElFantasma View Post
    b) 2bn x 23bThanks in advance!!!!!
    Is the "x" a multiplication sign? If so, use "*" in the future?
    Or did you mean a "+"; or "-" ?
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  5. #5
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    Re: Grade 9 Algebra help

    It is letter A. Is this really a grade 9 equation?

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  6. #6
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    Re: Grade 9 Algebra help

    Hey buddy, this is a math help site, not an advertizing spot !
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