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GMAT Prep

by ST » Wed Mar 25, 2009 5:37 am
anyone know how to solve this question?

ST
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by scoobydooby » Wed Mar 25, 2009 5:42 am
2^5+2^5+3^5+3^5+3^5
=> 2*2^5+3*3^5
=>2^6+3^6 [x^a*x^b=x^(a+b)]

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thank

by ST » Wed Mar 25, 2009 6:18 am
ok but I do not understand how 3^5 + 3^5 + 3^5 equal to 3^6

I think i am missing some number properties. would this be 3^7....just wondering...

ST
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by scoobydooby » Wed Mar 25, 2009 7:02 am
a+a+a=3a

therefore

3^5 + 3^5 + 3^5
=3 times 3^5
=3*3^5
=3^1*3^5
=3^(5+1)
=3^6
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Thank you

by ST » Wed Mar 25, 2009 8:36 am
I got it now.
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