119k views
0 votes
Empat sebutan pertama suatu jajang aritmetik ialah 3x-1,4x,5x+1,4.cari

a) beza sepunya
b) sebutan ke lapan

1 Answer

2 votes
Here, A.P. is 3x-1, 4x, 5x+1, 4

i) Common difference (d)
(5x-1) - 4x = x - 1
It would be same as 4 - (5x-1) = 4-5x+1 = 5-5x
Now, x - 1 = 5 - 5x
5x + x = 5 + 1
6x = 6
x = 6/6
x = 1

So, Common difference would be 1

ii) Eight term will be: a + (n-1)d = 2 + (8-1)2 = 2+7(2) = 2+14 = 16

So, eight term would be 16


Hope this helps!
User Kupi
by
7.8k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories