Question

For an AP, if Sn= 5n2-3n,then an=10n-8 true or false​

Answer 1

Answer:

Sum of the n terms of an A.P. is 5n2 - 3n. Find the terms of the A.P. and also find the 16th term.

Sn = 5n2 - 3n an = Sn - Sn - 1

an = 5n2 - 3n - [5(n - 1)2 - 3 (n - 1)]

an = 5n2 - 3n -[5(n2 - 2n + 1) - 3n + 3]

an = 5n2 - 3n - 5n2 + 10n - 5 + 3n - 3

an = 10n - 8

a1 = 2

a2 = 20 - 8 = 12

a3 = 30 - 8 = 22

a16 = 160-8= 152

Step-by-step explanation:

Answer 2

Answer:

True

Step-by-step explanation