exam Maths Puzzle Numerical Ability

EXPRESS AS A POLYNOMIAL: x + a(x^2-ax/ x)

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http://img115.imageshack.us/my.php?image=geometryquestion1pw7.jpg Find the sum of each geometric series described
1. asub1= 512 r=1/2 n=6
2. 3 + 6 + 12...+192
3. asub1= -2 asub5= -162 n=7