Sagot :
Réponse :
Explications étape par étape
Bsr,
M=(3x-4)(-7x+2)-(-3x-5)(7x-1)=
-21x² +6x +28 -8 -(-21x² +3x -35x +5)=
-21x² +6x +28 -8 +21x² -3x +35x -5=
38x +15
N=7x(3x+4)(7x+1)+(x+2)(x+2) =
(21x² +28x)(7x+1) +x²+2x +2x +4=
147x³ +21x² + 196x² +28x +x²+2x +2x +4=
147x³ 218x²+32x +4
☺
M=(3x-5)(-7x+2)-(-3x-5)(7x-1)
-21x²+6x+35x-10+(3x+5)
= -21 x²+6x+35x-10+21x²-3x+35x-5
= 7x-15
voila