exam Maths Puzzle Numerical Ability

simplify:

(3a^2-4b^2)^2

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Thank you in advance for helping me with writing this problem in interval notation. The absolute value of 2x+1>=3 I have( -infintiy, -2]U[1,infinity ) Am I close? David deposited $10,000 in a acount that pays 5% interest compounded annually. How much money was earned the first 10 years?