Réponse :
Bonjour,
A=
(3x+3 )(x-5)
= 3x² -15x +3x -15
= 3x² -12x -15
B=
(-6-2t) ( t-7)
= -6t +42 -2t² + 14t
= -2t² +8t +42
C=
(-x -5) ( 3y-6)
= -3xy +6x -15y +30
D=
(2x² -5x) ( 2-x)
= 4x² -2x³ -10x +5x²
=-2x³+ 9x² -10x
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Réponse :
Bonjour,
A=
(3x+3 )(x-5)
= 3x² -15x +3x -15
= 3x² -12x -15
B=
(-6-2t) ( t-7)
= -6t +42 -2t² + 14t
= -2t² +8t +42
C=
(-x -5) ( 3y-6)
= -3xy +6x -15y +30
D=
(2x² -5x) ( 2-x)
= 4x² -2x³ -10x +5x²
=-2x³+ 9x² -10x