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If the 9th term of an AP is five times the 5th term, find the relationship between a and d

+1 vote
asked Mar 1, 2013 in BASIC MATH by Afeez Novice

1 Answer

+1 vote

The n’th term of an AP is a + (n − 1)d

The 5th term is:     a + 4d
The 9th term is:   a + 8d

9th term is five times 5th term. so, a + 8d = 5(a+4d)

a + 8d = 5a + 20d

4a = -12d

a = =3d

 

answered Mar 3, 2013 by steve Scholar

4a = - 12d

a = - 3d

a/d = - 3/1

a = -3d

 

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