( x - 11 ) • ( x + 11)
x² + 11x - 11x - 121
x² + 0x - 121
x² - 121
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(x - 11) (x + 11)x² + 11x - 11x - 121
x² - 121
( x - 11 ) • ( x + 11)
x² + 11x - 11x - 121
x² + 0x - 121
x² - 121