x+y (x-2)(x+y); 18) 3-x x(x^ 2 -1); 19) x (x^ 2 -4 - Dicamon

Question

x+y (x-2)(x+y); 18) 3-x x(x^ 2 -1); 19) x (x^ 2 -4)(x+1); 20) x-y (x+y)(x+2y)

Answer

17 x-2 pm0(=)x+2 18 x ne6; x ne0 02 x+4 ne0; x7-1; x ne1 19 x - 2 = 6; x=x2; pi 2 ne0; x ne-2; x + 1 = 0

Answer

x-2 ne0  x+y ne0 matrix  matrix x ne2  x ne-y matrix; x ne0  x^ 2 -1 ne0 (x-1)(x+1) ne0 → - 1 K + lambda = 0; (x ne-1 40 (x-4) ne0  x+1 ne0  matrix (x-2)(x+2  x+1 ne0 matrix 10-240

tìm điều kiện xác định ạ!