Question

упростите вырожение (x-2)^2 -(x-1)(x+2)

Answer 1

(x-2)²-(x-1)(x+2)=x²-4x+4-(x²+x-2)=x²-4x+4-x²-x+2=-5x+6



((a-b)²=a²-2ab+b²)