Answer:
41) (x+2)² = (x+2)(x+2)
= x²+2x+2x+4
= x²+4x+4 ans...
42) (x-2)² = (x-2)(x-2)
= x²-2x-2x+4
= x²-4x+4 ans...
43) (x+1)(x-1) = x²-x+x-1
= x²-1 ans...
44) (5x+2)(x-2) = 5x² -10x +2x -4
= 5x² -8x -4 ans..
45) (3x+1)(2x+4) = 6x²+12x+2x+4
= 6x²+14x+4 ans...