Question

second term of the AP if its Sn=n^2+2n is .............​

Answer 1

Answer:

a2=5

Step-by-step explanation:

by putting n=1

S1=1^2+2(1)

S1=3

S1=a1

a=3

now,by putting n=2

S2=2^2+2(2)

S2=4+4=8

S2=a1+a2

8=3+a2

a2=5

Answer 2

Answer:

The second term of the AP is 5

Explanation:

$S_n=n^2+2n$

Substituting the value n=1, we get

$S_1=1^2+2*1\\a_1=3$

Substituting the value n=2, we get

$S_2=2^2+2*2\\S_2=8$

$S_2=a_1+a_2\\8 = 3+a_2\\a_2 = 5$

Addition:

The process of adding two or more things together is called addition. The process of computing the sum of two or more numbers in mathematics is called addition. It is a fundamental mathematical procedure that is frequently used in daily life. When we work with money, figure out our food bills, or figure out the time, we frequently employ addition. One-digit numbers can be added simply for solving addition problems, however for bigger numbers, we divide the numbers into columns using their corresponding place values, such as ones, tens, hundreds, thousands, and so on. Students learn basic addition sums in primary school, including one-digit facts, math addition sums, and double-digit math addition sums.

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