Write the first four terms of the sequence.
-$$\mathrm { a } _ { \mathrm { n } } = ( - 1 ) ^ { \mathrm { n } - 1 } ( 8 \mathrm { n } - 5 )$$
A) $- 3,11 , - 19 , - 27$
B) $3 , - 21,19 , - 27$
C) $3 , - 11,19 , - 27$
D) $3,11,19,27$

Question

Quizplus · Accepted Answer

To find the first four terms of the sequence, substitute $n = 1, 2, 3, 4$ into the formula $\mathrm { a } _ { \mathrm { n } } = ( - 1 ) ^ { \mathrm { n } - 1 } ( 8 \mathrm { n } - 5 )$. For $n=1$, $a_1 = 3$; for $n=2$, $a_2 = -11$; for $n=3$, $a_3 = 19$; for $n=4$, $a_4 = -27$.

Write the First Four Terms of the Sequence an=(−1)n−1(8n−5)\mathrm { a } _ { \mathrm { n } } = ( - 1 ) ^ { \mathrm { n } - 1 } ( 8 \mathrm { n } - 5 )an​=(−1)n−1(8n−5)

Write the First Four Terms of the Sequence $\mathrm { a } _ { \mathrm { n } } = ( - 1 ) ^ { \mathrm { n } - 1 } ( 8 \mathrm { n } - 5 )$