The difference of squares is another specially structured quadratic. The structure is given by, A difference of squares has a very specific factorization which we will learn about.
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Another form of interpreting the linear relation is with the parametric equation of a line. In this form we have an unknown or parameter value. Depending on how many parameters there are we determine the type of “plane” we have. In our case here we will see one parameter indicating that we have a line.