MA19.A2.7

Prove polynomial identities and use them to describe numerical relationships.

COS Examples

Example: The polynomial identity $1 - x^n = (1 - x)(1 + x + x^2 + x^3 + … + x^{n-1} + x^n)$ can be used to find the sum of the first n terms of a geometric sequence with common ratio x by dividing both sides of the identity by $(1 - x)$.