Question

The sum of first n terms of an ap is 5n^2+7n. The 10th term is ?

Answer 1

so,

the 10th term is 102

I hope this is the correct answer

Answer 2

Answer:

Step-by-step explanation:

sn 5n² + 7n

S, q. = 5(1)² + 7(1)

= 5+7 = 12

S, 2 = 5(2)² + 7(2)

20 + 14 = 34

S, 3 = 5(3)² + 7(3)

= 45 + 21 = 66

Ap = 12 , 34 - 12 = 22 , 66 - 34 = 32

Ap = 12 ., 22 , 32 ..

A = 12 , d = 22-12 = 10

A10 = a + (n-1)d

= 12 + (10 - 1) 10

= 12 + 90 = 102

Hope It helps uh

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