Răspuns :
x² + 2x +3x +6 = x·( x +2 ) + 3·(x+2) = ( x+2) ·( x+3)
b .
= x² -5x -7x +35 = x · ( x -5) -7 ·( x -5) = ( x-7)· ( x-5)
b .
= x² -5x -7x +35 = x · ( x -5) -7 ·( x -5) = ( x-7)· ( x-5)