exam Maths Puzzle Numerical Ability

What is the derivative of 8x^3/2-12x^-1/2?
Answer is 8/15(5x-2)^3/2. Not sure how they got the answer. Please help.

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What is the area of a circle with the circumference 18 pi centimeters?? I really need to find something that i can type in the problem and get the answer. Like not to so totally cheat, but like, so i can check it. Im in 9th grade and i had to take Pre-