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The nth term of an A.P is 7-4n. Find its common difference.

The nth term of an A.P is 7-4n. Find its common difference.

Grade:12th Pass

3 Answers

SAGAR SINGH - IIT DELHI
879 Points
10 years ago

Dear student,

1st term=7-4=3

2nd term=7-8=-1

Common difference=-4

vikas askiitian expert
509 Points
10 years ago

Tn = a+(n-1)d

Tn = a-d + nd      ............1

Tn = 7 - 4n               (given)      .............2

comparing both

-4n = nd

d = -4

Neer Varshney
76 Points
10 years ago

Put n=1 to obtain the first term,

a= 7-4 = 3.

Put n=2 to obtqin the second term,

a+d= 7-8 = -1.

Now d= (a+d)-d = -1 - 3 = -4.

common difference = -4

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