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3 years ago

9

the first, second and fifth term of a linear sequence (A. P) is /are three consecutive terms of an exponential sequence (G. P),

if the first term of the linear sequence is 7. Find the common difference.

1 answer:

vredina [299]3 years ago

8 0

Answer: common difference is 14

Step-by-step explanation:

a,a+d,a+4d

7,7+d,7+4d

(7+d)/7=(7+4d)/(7+d)

(7+d)(7+d)=7(7+4d)

49+14d+d^2=49+28d

d^2-14d=0

d(d-14)=0

d=0 or d-14=0

d=14

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