At about the 0:59 mark, the teacher puts parentheses on the board, but he changes the meaning of the expression by putting them where he does; the expression should look like: (x^2y-ax)-(xy-a) OR (x^2y-ax)+(-xy+a).
Simplify an expression with four terms by factoring
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Questions answered by this video:
How do I factor by grouping?
How do I simplify an expression that has 4 terms by factoring when there is nothing that all four terms share?
How can I factor x^2y-ax-xy+a?
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In this lesson, the teacher shows an example of factoring by grouping. He factors a polynomial with 4 terms, and there is nothing that all 4 terms share.