Answer:You're adding 7 each time (18 - 11 = 7, 25-18 = 7, etc etc)
Rule:
(nth term) = (previous term) + 7
a%5Bn%5D+=+a%5Bn-1%5D%2B7
The recursive rule is a%5Bn%5D+=+a%5Bn-1%5D%2B7
3x-x+2=4 ...
Step-by-step explanation:
Answer:
F(1) = -21
F(2) = -9 = -21 + 4 x 3 = F(1) + 4 x (2^2 - 1)
F(3) = 11 = -21 + 4 x 8 = F(1) + 4 x (3^2 - 1)
F(4) = 39 = -21 + 4 x 15 = F(1) + 4 x (4^2 - 1)
...
F(n) = F(1) + 4 x (n^2 - 1)
=> F(5) = -21 + 4 x (5^2 - 1 ) = -21 + 4 x 24 = 75
=> F(6) = -21 + 4 x (6^2 - 1) = -21 + 4 x 35 = 119
Hope this helps!
:)
