Question

find the 10th term of the following expression (i)7n+20 (ii)
${n}^{2} + 1$

Answer 1

(I) 7n+ 20

an= a+(n-1) d
an= 7n +20
a10 = 7×10 +20
= 70+20
= 90

(ii) n^2 +1

an= a+(n-1) d
an = (n) ^2+1

a10= (10) ^2+1
= 100 +1
= 101