These numbers have no common factor (7 x 7 and 2 x 2 x 2 x 2 x 2 x 2) so LCD is 49 x 64 ie 3136.
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what is the common denominator of 49 and 9
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The least common denominator of 7 and 49 is 49. You can find this by realizing that 7 goes into 49 without any remainder. This means that anything that is divisible by 49 without a remainder is divisible by 7 without any remainder. So since we want the least common denominator of 7 and 49, we just have 49, 49/49=1 and 49/7=7.
LCD(49, 72) = 3528
At least one other fraction is needed to determine a common denominator.