Difference of Squares worksheets - basic to challenge level

This file consists of four levels of worksheets in regards to Difference of Squares.
Bronze level has simple straight forward equations consisting of difference of squares that the students need to factor. There are four different sheets at this level for variety. This level does not have the full solutions for the questions.
Silver level worksheets require that the students not only factor the difference of squares, but also gather like terms and common factor to find the difference of squares. There are four different sheets at this level for variety. There are full solutions given for each worksheet, for the second part and on.
Gold level worksheets require that the students to gather like terms, common factor but also deal with exponents greater then two and fractions. There are four worksheets at this level along with full solutions, for part two and on.
The challenge level is here for the students who need the challenge, as it introduces two variables, and asks the students to solve for x. This is a good intro for finding roots with functions.