book Maths Puzzle Numerical Ability

What is the sum of 4a to the 2nd -7a-5 and -6a to the 2nd -2a + 7

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determine the constant term in the expansion of (x + 2)^9 i have a probel. i cant solve this question. DETERINE THE COEFFICIENT OF THE (A TO THE THRID POWER) TERM IN THE EXPANSION OF (A+1) TO THE TENTH POWER>