Use Summation Notation
-$$\sum _ { k = 2 } ^ { 4 } k ( k - 4 )$$
A) $- 7$
B) $- 10$
C) $- 4$
D) 6 )6

Question

Quizplus · Accepted Answer

The summation notation $\sum _ { k = 2 } ^ { 4 } k ( k - 4 )$ means to sum the expression $k(k-4)$ for $k$ values from 2 to 4. Calculating each term: For $k=2$, the term is $2(2-4) = 2(-2) = -4$. For $k=3$, the term is $3(3-4) = 3(-1) = -3$. For $k=4$, the term is $4(4-4) = 4(0) = 0$. Summing these terms gives $-4 + (-3) + 0 = -7$.

Use Summation Notation - ∑k=24k(k−4)\sum _ { k = 2 } ^ { 4 } k ( k - 4 )k=2∑4​k(k−4)

Use Summation Notation
- $\sum _ { k = 2 } ^ { 4 } k ( k - 4 )$