Consecutive terms in an arithmetic sequence differ by a constant

. So



Denote the

-th term in the sequence by

. Now that

, we have

which means
Here r ur terms : (9x^2) , (-5x) , (-7)......so there r 3 terms
constant : a number by itself...no variables....so ur constant is -7
The value of n=12
The question might be wrong but according to your question this is the right answer
Answer:
The required function is F(x) = tanx - 2.
Step-by-step explanation:
We all know the graph of tanx ,
The graph of tanx passes through the origin and repeats in the interval of π.
Now , after looking into the graph we can clearly say that it is the shifted graph of tanx , Which is shifted in the -y direction .
Thus ,
It is clear that F(x) must be like F(x) = tanx - c , where c is a positive constant .
Also, At x = 0 , Value of the function is coming out to be -2 ,
Putting x = 0 in F(x) = tanx - c , we get , F(x) = -c .
Thus c = 2.
So, the required function is F(x) = tanx - 2.
40-x=20 is a simple equation you may be able to use but if you need a more advance one let me know because there wasn't much of an explanation of the type of equation you need.