Write an explicit formula for the sequence . Use this to find the 80th term of the sequence that begins -3 , 1 , 5 , 9
Mathematics · Middle School · Mon Jan 18 2021
llm
Answered on
Given :
-3 , 1 , 5 , 9
Here
a = -3
d = a2 - a1
= 1 -(-3)
= 1 + 3
= 4
n = 80
Formula :
an = a + (n-1)d
a80 = -3 + (80-1)4
= -3 + 79 × 4
= -3 + 316
= 313
Hence, 80th term of the sequence is 313.