Question

x^2 -y^2-2y -1 factorise​

Answer 1

Step-by-step explanation:

${x}^{2} - {y}^{2} - 2y - 1 \\ = x \times x - y \times y - y - y - 1 \\ = x - y - y - 1 \\ = x - 2y - 1$