What is the 25th term of the arithmetic sequence where a1 = 8 and a9 = 48?
2 Answers
Jul 9, 2018
Explanation:
We know that ,
color(blue)(n^(th)term " of the arithmetic sequence is :"nthterm of the arithmetic sequence is :
color(blue)(a_n=a_1+(n-1)d...to(I)
We have ,
color(red)(a_1=8 and a_9=48
Using
Again using
a_25=a_1+(25-1)d
Jul 9, 2018
Explanation:
"the n th term of an arithmetic sequence is"
•color(white)(x)a_n=a_1+(n-1)d
"where d is the common difference"
"given "a_1=8" then"
a_9=8+8d=48rArr8d=40rArrd=5
a_(25)=8+(24xx5)=128