Use the structure of an expression to identify ways to rewrite it. For example, see x^4?y^4 as (x^2)^2?(y^2)^2, thus recognizing it as a difference of squares that can be factored as (x^2?y^2)(x^2+y^2).
Exercises from Illustrative Mathematics A set of exercises, commentary, and solutions
For this unit, choose:
A-SSE Seeing Dots A-SSE Equivalent Expressions A-SSE Sum of Even and Odd A-SSE A Cubic Identity