(3-x)(x-1)=3x-3-x^2+x=-x^2+4x-3
( 3 - x ) · ( x - 1 ) = 3x - 3 - x² - ( -x ) = -x² + 3x + x - 3 = -x² + 4x - 3
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(3-x)(x-1)=3x-3-x^2+x=-x^2+4x-3
( 3 - x ) · ( x - 1 ) = 3x - 3 - x² - ( -x ) = -x² + 3x + x - 3 = -x² + 4x - 3