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    survivorboi's Avatar
    survivorboi Posts: 431, Reputation: 9
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    #1

    Feb 7, 2009, 06:12 PM
    how can I do this math equation?
    there is a math problem I don't know how to do, it goes:

    6^(x+1)-6^x=1080

    the little ^ sign means that it's squared, cubed, etc.

    how do I do it? Please give step-by-step instructions and remember: I'm only in 7th grade so use 7th grade vocabulary! Please explain it as simply as you can :D
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
     
    #2

    Feb 7, 2009, 06:57 PM
    By the property of exponents, we can rewrite

    So now we have:



    Factor out the 6^x:





    Divide by 5:



    Now, 6 to what power is 216?

    Can you see it? It's a nice integer. Nothing fancy.

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