Question 1145577
Express each as a single power of 2. 
2^a+b X 2^a-b 
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Does X mean multiply?
Use * (Shift 8) for multiply.
Everyone is doing it.
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2^a+b * 2^a-b
If you mean
{{{2^(a+b) * 2^(a-b)}}}
When multiplying, add exponents.
---> {{{2^(2a)}}}