Find the sum of the sequence.
-$$\sum _ { k = 3 } ^ { 5 } \left( k ^ { 2 } - 9 \right)$$
A) $- 15$
B) 23
C) 10
D) $- 3$

Question

Quizplus · Accepted Answer

The sum of the sequence is calculated by substituting the values of $k$ from 3 to 5 into the formula $k^2 - 9$ and adding the results. For $k = 3$, the term is $3^2 - 9 = 0$. For $k = 4$, the term is $4^2 - 9 = 7$. For $k = 5$, the term is $5^2 - 9 = 16$. Adding these terms together gives $0 + 7 + 16 = 23$.

Find the Sum of the Sequence ∑k=35(k2−9)\sum _ { k = 3 } ^ { 5 } \left( k ^ { 2 } - 9 \right)k=3∑5​(k2−9)

Find the Sum of the Sequence $\sum _ { k = 3 } ^ { 5 } \left( k ^ { 2 } - 9 \right)$