Question

Factorise the following:
(i) x² + y² - 2xy - 4z²

please explain step by step​

Answer 1

Answer:

x² + y² -2xy -4z²

= (x² +y² -2xy) -(2z)²

= (x -y)² - (2z)²

= (x -y -2z)( x - y +2z)

this is the answer.

Step-by-step explanation:

formula used

(a -b)² = a² + b² -2ab

and

a² - b² = (a +b)(a - b).

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