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Descompuneti in factori : x^2-x-12

Răspuns :

x² - x - 12 = x² - 9  -x - 3 = ( x -3 )· ( x +3 ) - ( x +3 ) =
=( x +3 )· ( x -3 - 1 ) = ( x +3 )· ( x -4 )