SOLVE IT ...

For students of class 6-8 (age 12 to 14)
ataher.sams
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SOLVE IT ...

Unread post by ataher.sams » Mon Dec 05, 2011 8:40 am

\[2^{x-1}+2^{x+1} = 320\]

Can anyone please show me the process... :roll:
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nafistiham
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Re: SOLVE IT ...

Unread post by nafistiham » Mon Dec 05, 2011 11:36 am

well, this is kind of text book type question from IX-X
\[2^{x+1}+2^{x-1}=320\]
\[\Rightarrow 2^{x}\left ( 2+\frac{1}{2} \right )=320\]
\[\Rightarrow 2^{x}\cdot \frac{5}{2}=320\]
\[\Rightarrow 2^x=128\]
\[\Rightarrow x=7\]
;)
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