Question

write the first 4 terms of AP if sum of first n terms is 5n²+3n

Answer 1

Answer:

8,, 12,14

Step-by-step explanation:

first take n value as one to find the 1st term then take n as 2 to find the commen difference the use the basic AP formula to find all the terms

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Answer 2

Let take n= 1,2,3,4

n=1

5(1)2 + 3(1)
5 + 3
8
n=2

5(2)2 +3(2)
5*4 + 3*2
20 + 6
26

n=3

5(3)2 + 3(3)
5*9 + 9
45+ 9
54

n=4

5(4)2 + 3(4)
5*16 + 12
80 + 12
92