Question

the first term of an ap is 5 and its common difference is -2 what is its 10th term​

Answer 1

Answer:

$clearly \: \\ a1 = 5 \\ d = - 2 \\ a10 = 5(10 - 1) \times - 2 \\ 45 \times - 2 \\ = - 90$

Answer 2

Answer:

nth term of an ap=a+(n-1)d

a=5,d= -2,n=10

5(10-1)-2

=5×9(-2)

= -90

10th term of A.P is -90