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(2x+4)(5x-3)

(8x+1)(2x-6)

(-2x+1)(3x+1)

(5x-5)(4x+1)


Répondre :

bonjour;

(2x+4)(5x-3)

= 10x² -6x +20x -12

= 10x² +14x -12

(8x+1)(2x-6)

= 16x² -48x +2x -6

= 16x² -46x -6

(-2x+1)(3x+1)

=  -6x² -2x +3x +1

= -6x² +x +1

(5x-5)(4x+1)

= 20x² +5x -20x -5

= 20x² -15x -5