Bonjour,
A = (9x - 8) X (-6x + 5)
= -54x² +45x +48x -40
= -54x² + 93x-40
B = (8x - 6)-(-11x -9)
= 8x - 6+11x + 9
= 19x +3
C = 2x + 3x(-8x + 12)
2x - 24x² + 36x
= -24x² +38x
D =(3x + 6)²
IR
= 9x²+36x +36
E = (7x – 9)x(9+ 7x)
IR
= 63x +49x²-81 -63x
= 49x² -81
F = (9x - 2)²
IR
= 81x² -36x +4