x(x-1)+4(x-2)(x+1)=

x(x-1)+4(x-2)(x+1)=x²-x+4(x²-x-2)=x²-x+4x²-4x-8=5x²-5x-8

x(x-1)+4(x-2)(x+1)= =x2-x+4(x2+x-2x-2)= =x2-x+4x2+4x-8x-8= =5x2-5x-8