Question

factorise x2 - y2 - 2y - 1

Answer 1

Answer:

X^2-(y^2+2y+1^2)

x^2-(y+1)^2

{x-(y+1)} {x+(y+1)}

(x-y-1)(x+y+

Answer 2

Answer:

(x+y+1)(x-y-1)

Step-by-step explanation:

x^2-y^2-2y-1

=(x)^2-[(y)^2+2×y×1+(1)^2]

=(x)^2-(y+1)^2

=[x+(y+1)][x-(y+1)]

=(x+y+1)(x-y-1)