Math, asked by vikpfizer, 17 days ago

if an =7n+2 find d and a11 ​

Answers

Answered by Dragonnightfury
1

Answer:

Given S

n

=2n

2

+5n

S

n−1

=2(n−1)

2

+5(n−1)

          =2(n

2

−2n+1)+5n−5

          =2n

2

−4n+2+5n−5

          =2n

2

+n−3

Now,  t

n

=S

n

−S

n−1

              =2n

2

+5n−(2n

2

+n−3)

              =2n

2

+5n−2n

2

−n+3

              =4n+3

Step-by-step explanation:

Answered by sdp3076
1

Answer:

Step-by-step explanation:

an =7n+2 is the general equation of terms

let's find the first term a or t₁=(7×1)+2=9

let's find the second term t₂=(7×2)+2=16

so we know that common difference "d" is the difference between two consecutive terms.

so d=t₂-t₁=16-9=7

a₁₁=(7×11)+2=77+2=79

so d=7 and a₁₁=79

hope this helps

thanks :)

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