9. Using calculus to show minimum and maximum values taken by functions, find and prove(Create your own numerical example to show mathematically): a) For a fixed positive sum of two numbers, when is their product maximum ? b) For a fixed positive sum of two numbers, can you say anything about wen their product is minimum? c) For a fixed positive product of two numbers, when is their sum minimum? d) For a fixed positive product of two numbers, can you say anything about when the sum is maximum?

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A: Solution:   Given that A & B are sets of real numbers such thatA = z | z>2B = z | z≤8

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Q: find the minimum value of

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Q: 1. What are the zeros to the following quadratic function? 3 2 -2 -1 0 1 2 4 5 6 -1 -2 -3

A: See the details solution given below

Q: How many zeros (solutions) does the following quadratic relation have? f(x) = x² + 2x + 2

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