Question

Factorise x²-2xy-x²-z²

Answer 1

We have, x²-2xy-x²-z², and are asked to factor it.

First, combine any like terms.
=> x²-2xy-x²-z² => (x²-x²)-2xy-z² => -2xy-z²

The expression, -2xy-z², doesn’t have any common factors, but we can take out a -1.

Thus, we get -(2xy+z²)

Answer 2

-2xy-z^2

Explanation:

combine like terms

x^2-2xy-x^2-z^2

-2xy-z^2