Question

The nth term of AP is 7-4n. find its common difference

Answer 1

an = 7-4n

So,  

a1 = 7-4(1) = 3

a2 = 7-4(2) = -1

a3  = 7-4(3) = -5

therefore,

common difference = a3-a2 = a2-a1

(-5)-(-1) = (-1)-3

cd = -4 = -4       


☺HOPE IT'S HELPFUL ☺   

Answer 2

Hey!!!
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Here is your answer
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nth term =7-4n
1st term=7-4*1
=7-4=3
2nd term=7-4*2
=7-8=-1
d=-1-3
=-4
common difference =-4
I hope it will help you!!!!