Sagot :
B= (3x + 2)(x -3) -x(x -4)
= 3x² -9x +2x -6 -x *(x -4)
= 3x² -9x +2x -6 -x² +4x
= 2x² -9x +2x -6 + 4x
= 2x² -30x -6
C= (5x -4)(3x +1) + (x +1)(x -4)
= 15x² +5x -12x -4 + (x +1)(x -4)
= 15x² +5x -12x -4 +x² -4x +x -4
= 16x² +5x -12x -4 -4x +x -4
= 16x² -10x -4 -4
= 16x² -10x -8
D= 3x (x -5) - (2x +3)(x -5)
= (x -5) *(3x -(2x +3))
= (x -5) *(3x -2x -3)
= (x -5) *(x -3)
= x² -3x -5x +15
= x² -8x +15
E= (5x -2)(x -3) -4(4x +5)
= 5x² -15x -2x +6 -4(4x +5)
= 5x² -15x -2x +6 -16x -20
= 5x² -33x +6 -20
= 5x² -33x -14
(Donc j’espère que tu as compris si tu n’as pas compris la logique de certains calculs tu peux me poser des questions ne te gêne pas bye )
= 3x² -9x +2x -6 -x *(x -4)
= 3x² -9x +2x -6 -x² +4x
= 2x² -9x +2x -6 + 4x
= 2x² -30x -6
C= (5x -4)(3x +1) + (x +1)(x -4)
= 15x² +5x -12x -4 + (x +1)(x -4)
= 15x² +5x -12x -4 +x² -4x +x -4
= 16x² +5x -12x -4 -4x +x -4
= 16x² -10x -4 -4
= 16x² -10x -8
D= 3x (x -5) - (2x +3)(x -5)
= (x -5) *(3x -(2x +3))
= (x -5) *(3x -2x -3)
= (x -5) *(x -3)
= x² -3x -5x +15
= x² -8x +15
E= (5x -2)(x -3) -4(4x +5)
= 5x² -15x -2x +6 -4(4x +5)
= 5x² -15x -2x +6 -16x -20
= 5x² -33x +6 -20
= 5x² -33x -14
(Donc j’espère que tu as compris si tu n’as pas compris la logique de certains calculs tu peux me poser des questions ne te gêne pas bye )