Question

Pls answer the question
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Answer 1

Answer:

• 4n+3

Step-by-step explanation:

put 1 in place of n to get 1st term

so,

a=2×1²+5×1

a=7 .......(1)

now put 2 in place of n to get sum of first two terms

a=2×2²+5×2

a=18 ........(2)

subtract (1 ) from (2) to get 2nd term

2nd term = 18-7

= 11

now to get common difference then subtract 1st term from 2nd term

d = 11-7

=4

now a=7 and d=4 . so,

nth term =7 +(n-1)4

=7+4n-4

=4n+3