A= -(2x-6)² + (4-5x) (x+1) -6 (x+1)² + (8x-4) (4+8x)
=-(4x²-24x+36)+4x+4-5x²-5x-6(x²+2x+1)+32x+64x²-16-32x
= -4x²+24x-36+4x+4-5x²-5x-6x²-12x-6+32x+64x²-16-32x
=49x²+11x-54
B= 100 - (4x+6)² -4 (1-x) (-9x+2)
=100-(16x²+48x+36)-4(9x+2+9x²-2x)
=100-16x²-48x-36-36x-8-36x²+8x
= -52x²-76x+56