3. Five terms are in A.P. The product of first and last terms is 28, If the first term is 6 less than its third term.
Then find A.P.
[Hint: Let the numbers be a- 2d, a-d, a a + d, a + 2d).
Answers
Answered by
3
Answer:
- (a-2d)(a+2d)=28
- a square -4d=28 -1eq
- given a-2d=a-6
- by solving we get d as 3
- substitute in 1 eqby solving we get a =8
- then a-2d=2
- therefore ap:2,5,8,11,14
Answered by
0
Answer:
given five terms =a-2d,a-d,a,a+d,a+2d
Step-by-step explanation:
(a-2d)(a+2d)=a^2 - 4d^2=28 equation 1
a-2d-6=a
d=-3
a^2-36=28
a^2= 64
a=8
therefore A.P= 8,5,-2 and so on
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