book Maths Puzzle Numerical Ability

determine the constant term in the expansion of (x + 2)^9

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book Other Question

No matter how I try, I am not understanding this type of problem....
3x -2y + 5z
____________
2y -3x -5z

This is how I try....
3x (3x-2y + 5z) -(2y + 5z)
_________ What is the sum of 4a to the 2nd -7a-5 and -6a to the 2nd -2a + 7