Question

find the 10th term of the AP whose sum of n term is given by 2n^2 + 3​

Answer 1

Your answer is in the img form.

Answer 2

Step-by-step explanation:

Sn = 2n^2 +3

S1= 2(1)^2 + 3 = 2+3 =5 = a1

S2= 2(2)^2 + 3 = 2×4+3= 8+3 =11

Sn -S1 = a2

4 - 3 = 1

d= 1 - 3

= -3

thus, A.P is 3,1,...

a10 = a + 9d

= 3 + 9×(-3)

= 3 + (-27)

= 3 - 27

= -24

thus, a10 = -24

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