Question

if tn =2n²+3,find the value of t7 or a7
please help me please​

Answer 1

Answer:

101 and 34

Step-by-step explanation:

2= d÷2 ( acc. to the property of ap )

d = 4

3 = a-d/2

3 = a-4/2

6 = a-4

a = 10

t7 = 2×7×7 + 3

= 98+3 = 101

a7 = a+6d

= 10 + 6×4

= 10+24

= 34