Question

Can a^m-n be zero?
Please answer

Answer 1

Answer:

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Step-by-step explanation:

First of all here, you should be careful with even power.

(1) Here we have two possibilities.

If , then  and . The answer is No.

If , then  and we have two cases again: if n-even, then  (the answer is again No); if n-odd, then  and  (the answer is again No). Sufficient.

(2) If m=-3 and n=2, then , but if m=-1, n=2, then . Insufficient.