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Hi Jerry. The two parts of the question seem the same to me. Here's how I would solve it. Let c = a6. Then 1/c = 1/a6 = b6. Then we are to show that: c + 4/c > 4 for all positive real values of c. Since c is positive, we can multiply both sides by c, then see a quadratic: c2 + 4 > 4c which is a perfect square: (c - 2)2 > 0 So the value of c = 2 is the only problem here. Can you complete the question now? | ||||||||||||
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