Question

efectuar :(x+2)²-2(x+2)(x+1)+(x+1)²

Answer 1

(x+2)²-2(x+2)(x+1)+(x+1)²

x²+2x+2²-2(x²+x+2x+2)+x²+1x+1²

x²+2x+4-2(x²+3x+2)+x²+1x+1

x²+2x+4-2x²-6x-4+x²+1x+1

x²+x²-2x²+2x-6x+1x+4-4+1

2x²-3x+1