Question

If a3 = 5, a7 = 9 then the common difference is.
a) 4
b) -4
c) 1
d) -1​

Answer 1

your answer is below

Step-by-step explanation:

-4 is the correct answer

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Answer 2

Answer:

1

Step-by-step explanation:

a3=a+2d

5=a+2d  -----(1)

a7=a+6d

9=a+6d  -----(2)

(1)-(2) gives

5-9 = a+2d-a-6d

-4 = -4d

d=  -4/-4 = 1