Find the domain of the function $a(x) = \sqrt{3^x - 7^x}.$
Question:
Find the domain of the function $a(x) = \sqrt{3^x - 7^x}.$
Answer:
Let's think step by step.

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(-\infty,0]
Find the domain of the function $a(x) = \sqrt{3^x - 7^x}.$
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