Bonsoir,
A= 4 - 2x(3x + 5)
= 4 - 6x² -10x
B = (7x – 8) (4x – 6) + 10
= 28x² -42x -32x +48 +10
= 28x² -74x +58
C = 7(3-2x) - 4x(2x - 1)
= 21 -14x -8x² +4x
= -8x² -10x +21
D = 5(x - 1) - 7x(2x - 3)
= 5x -5 -14x² + 21x
= -14x² +26x -5
E = 3(7x² + 2x - 8) - (4x + 1)(5 - 9x)
= 21x² +6x -24 -( 20x -36x² +5 -9x)
= 21x² +6x -24 - 20x +36x² -5 +9x
= 57x²-5x -29
F = 6(x + 3) + (2x - 3)(3x - 5)
= 6x +9 +6x² -10x -9x +15
= 6x² -13x +24
