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ANTONII [103]
2 years ago
9

The n-th term of a number pattern is as follows:

Mathematics
1 answer:
Ilia_Sergeevich [38]2 years ago
7 0

9 = 3² is not prime, so T_9 = 9^2-8 = 81-8 = 73.

7 is prime, so T_7 = 7\times7+6 = 55.

Then the difference is T_9 - T_7 = 73 - 55 = \boxed{18}.

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