(x + 10 ) • ( x - 10)
x² - 10x + 10x - 100
x² - 100
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x.x + x.(-10) + 10.x + 10.(-10)
x² - 10x + 10x - 100 = x² - 100 ok
(x + 10 ) • ( x - 10)
x² - 10x + 10x - 100
x² - 100