Step-by-step explanation:
Given sequence,
-4, -24, -144, .....
Since,
Thus, the given sequence is the Geometric sequence having common ratio 6,
Since, the formula of nth term of a GP is,
Here, a = -4 ( first term ) and r = 6 ( common difference,
Let x represents the total number of terms,
And, f(x) represents the xth term,
Then the required formula would be,