Question

if an is equal to 2nsquare + 5 find A3 ​

Answer 1

Answer:

an = 2n^2 + 5

an = 2(1)^2 + 5

an = 2 +5

an = 7

2(2)^2 + 5

8+5

13

Common difference

13-7

6

a+ 2d

7 + 2*6

7+12

19