The nth term of a sequence is n2 – 6n – 4. Find the sum…

The nth term of a sequence is n² – 6n – 4. Find the sum of the 3rd and 4th terms.

Correct Answer: Option D

Explanation

n² – 6n – 4
For the 3rd term,
3² – 6(3) – 4
9 – 18 -4 = -13
For the 4th term,
4² – 6(4) – 4
16 – 24 – 4 = -12
Sum of both terms
-13 – 12 = -25

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