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by heshamelaziry » Mon Nov 30, 2009 5:09 pm
9^21 + 9^22 + 9^23 =

I don't have OA. I did 9^21( 1 +1 + 2) = 9^21 * 4 = 9^21 * 2^2. I tried to manipulate this to get to the right answer but could not !!!!!!

Any Thoughts ?
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by adam15 » Mon Nov 30, 2009 6:50 pm
I actual you need to factorize the 9^21(1+9+81)=91*9^21
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by heshamelaziry » Mon Nov 30, 2009 7:18 pm
adam15 wrote:I actual you need to factorize the 9^21(1+9+81)=91*9^21
How do I get ( 1+9+81) when I factorize 9^21 ?

Thanks
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by papgust » Mon Nov 30, 2009 10:45 pm
9^21 * 1 + 9^21 * 9^1 + 9^21 * 9^2

Take 9^21 out,

9^21 (1+9^1+9^2) = 9^21 (1+9+81)
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