Question

the 21st term of AP whose first two terms are - 3 and minus 4 is

Answer 1

a=-3
a2=-4
d=-1

a21=-3+20(-1)=-3-20=-23



hope it helps

Answer 2

Answer:

-23

Step-by-step explanation:

First two terms of A.P. are -3 , -4

$a_1=-3$

$a_2=-4$

So, d = $a_2-a_1$

d= -4 -(-3)

d= -1

Formula of nth term :$a_n=a+(n-1)d$

So, $a_{21}=-3+(21-1)(-1)$

$a_{21}=-3-20$

$a_{21}=-23$

Hence the 21st term is -23