Question

Find the sum of n terms whose n term is 5n+4

Answer 1

Answer:

9n

Step-by-step explanation:

first of all you have to keep the power side then plus the no.5+4=9,then the answer came 9 and then add the power n then the answer came= 9n

Answer 2

Step-by-step explanation:

Nth Term = 5n + 4

First Term (a) = 9

Second Term = 14

Common Difference (d) = 5

Sum upto nth term = $\frac {n} {2} \times (2a + (n-1)d)$

= $\frac {n} {2} \times (2(9) + (n-1)5)$

= $\frac {n} {2} \times (18 + 5n - 5)$

= $\frac {n} {2} \times (13 + 5n)$

= $\frac {5 {n} ^ {2} + 13n} {2}$

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