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How to factor quadratics with two variables with rearranging (example)
: Sal rearranges 30x^2+11xy+y^2 as y^2+11xy+30x^2 and then factors it as (y+5x)(y+6x).
How to factor a polynomial with two variables by grouping (example)
: Sal factors 5rs+25r-3s-15 as (s+5)(5r-3).
How to factor a difference of squares with two variables (example)
: Sal factors x^2-49y^2 as (x+7y)(x-7y).
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