Question

find a1,a2,a4 if a3 is -7 and a5 is 1 in arithmetic progression ​

Answer 1

Answer:

a4 = -3 a2 = -11 a1 = -15

Step-by-step explanation:

if a3 is -7 and a5 is 1 that means every term has difference of 3

Answer 2

Answer:

-13 , -10 , -7 , -4 .......

Step-by-step explanation:

a3 = -7

a5 = 1

a = ??

d = ??

==: an = a + (n - 1)d

==: a3 = -7

==: a + (3 - 1)d = -7

==: a + 2d = -7     ............(1)

==: an = a + (n - 1)d

==: a5 = 1

==: a + (5 - 1)d = 1

==: a + 4d = 1     ..............(2)

From 1 and 2 we get,,

a = -13 and d = 3

a1 = a = -13

a2 = a + d = -13 + 3 = -10

a4 = a + 3d = -13 + 9 = -4

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