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wlad13 [49]
3 years ago
7

This is about exponents

Mathematics
1 answer:
bulgar [2K]3 years ago
6 0

Answer:

B

Step-by-step explanation:

Using the rules of exponents

a^{m} × a^{n} ⇔ a^{(m+n)} and

a^{0} = 1, then

9^{x} × 9^{-x}

= 9^{(x-x)}

= 9^{0} = 1 → B

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