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Here is a problem that one of my students sent me...          







Here's how I'd attack this...   


FOIL

(2x - 5)   (2x + 5)  =  5


4x^2    -10x   +10x   - 25   =   5


4x^2    - 25                    =    5


add 25 on both sides

4 x^2                            =   30

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