Write an equation to describe the sequence below. Use n to represent the position of a term in the sequence, where n = 1 for the first term.
-3, 12, -48, …
To describe the sequence -3, 12, -48, ... with the variable n representing the position of a term in the sequence, we can observe that each term is obtained by multiplying the previous term by -4. Therefore, the equation to describe the sequence is:
an = -4 * an-1
where a1 = -3 is the first term of the sequence.