Thesum of first three numbers n an ap is 18 if the product of the first and last term
Answers
Answered by
0
Answer:
Step-by-step explanation:
Let no. be a-d, a , a+d and d be the common difference
according to question
a-d+a+a+d=18
a=6
Also
(a-d)(a+d)=5d
a^2 - d^2 = 5d
36 - d^2 = 5d
d^2 + 5d - 36 = 0
d^2 + 9d - 4d - 36 = 0
d(d+9) - 4(d+9) = 0
(d+9)(d-4) = 0
hence d = 4 or -9
the first three numbers are
a-d = 6-4 = 2
a = 6
a+d = 6+4 = 10
hope you got the solution and the question is also incomplete
Similar questions