(x-1)(x-2)-3x(x+3)+2(x+2)²
= (x^2-3x+2) - (3x^2+9x) + 2(x^2+4x+4)
= x^2-3x+2 - 3x^2-9x + 2x^2+8x+8
= x^2- 3x^2 + 2x^2-3x -9x+8x+2+8
= -4x+10
(x-1)(x-2)-3x(x+3)+2(x+2)²
= (x^2-3x+2) - (3x^2+9x) + 2(x^2+4x+4)
= x^2-3x+2 - 3x^2-9x + 2x^2+8x+8
= x^2- 3x^2 + 2x^2-3x -9x+8x+2+8
= -4x+10