(2-x)^2-x(x+1,5)= (2-x)(2-x)-x(x+1.5) = (4-2x-2x+x2)-x(x+1.5) = 4-2x-2x+x2-x(x+1.5) = 4-2x-2x+x2-x2-1.5x = – 5.5x + 4