Example: First Five Terms of $a_n = (-1)^n n^3$

A manufacturing quality control system tracks the deviation of a part's weight from a target. The measurements alternate between being slightly over the target (positive) and slightly under the target (negative). If the first measurement ($n = 1$) is over the target, which factor should be included in the sequence formula to produce the sign pattern ${}1, -1, 1, -1, \dots$?

An operations manager is tracking a machine's calibration error, which alternates between being below target and above target each cycle. The first cycle ($n = 1$) records a negative error, the second cycle records a positive error, and the pattern continues. To properly model this alternating sign sequence starting with a negative value, the manager should use the factor $(-1)^{n+1}$ in their mathematical formula.

In sequence formulas, factors involving powers of $-1$ are used to alternate signs between positive and negative values. Match each expression or mathematical property with the specific pattern or value it produces, assuming $n$ represents the term number starting at $n=1$.

Sign Alternation in Data Monitoring

In a financial model, an analyst uses the sequence factor $(-1)^n$ to alternate between debits (negative values) and credits (positive values). This factor ensures that the first term ($n = 1$) is a debit because $(-1)$ raised to any ____ power results in a negative value.

Alternating Signs in Business Forecasting