Question

2 x-3 { x +2[x - ( x + 5)]+1}

Answer 1

2 x-3 { x +2[x - ( x + 5)]+1}
2x-3 (x+2(x-x-5))+1
2x-3 (x²-x²-5x+2x-2x-10)+1
2x-3(-5x-10)+1
-10x²-20x+15x+30+1
-10x²-5x+31
10x²+5x-31 aplicar la formula general y salen 2 valores