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OpenStudy (anonymous):
expand and explain: (x+1)(x-1)(x-3)
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OpenStudy (luigi0210):
Distribute the first one, use foil, which turns out to be the difference of two perfect squares: (x+1)(x-1)=x^2-1 Now distribute that out to the next problem: (x^2-1)(x-3) So foiling it and you get: |dw:1375909699146:dw|
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