Question

Efetue as operações:

a) (2xy+3) (x²-2) - (x-1)²

Answer 1

$(2xy+3)(x^2-2)-(x-1)^2= \\ \\ 2xy(x^2)-2xy(-2)+3x^2-6-(x^2-2x+1)= \\ \\ 2x^3y+4xy+3x^2-6-x^2+2x-1= \\ \\ 2x^3y+4xy+3x^2-x^2+2x-6-1= \\ \\ 2x^3+4xy+2x^2+2x-7$