Question

Формулы сокращенного умножения.
1. (x + y)²
2. 4x²+12x +9
3.(x-y)(x+y)
4.x²-y²
5.x³-y³

Answer 1

$(x+y)^2=x^2+2xy+y^2\4x^2+12x+9=(2x+3)^2\(x-y)(x+y)=x^2-y^2\x^2-y^2=(x-y)(x+y)\x^3-y^3=(x-y)(x^2+xy+y^2)$