Question

If d=-2 a22=-39 find a​

Answer 1

Answer:

given that d=-2

a22=-39

Step-by-step explanation:

a22=a+(n-1)×d =-39

=a+(22-1)×-2=-39

=a+(20)×-2=-39

=a+-40= -39

a =-39+40

a=1

Answer 2

Given:

d = -2

a22 = -39

To find:

a = ?

Formula should be used:

an = a + (n - 1)d

Solution :

an = a +(n - 1)d

a22 = a + (22 - 1)-2

-39 = a + 21(-2)

-39 = a - 42

a = -39 + 42

a = 3