factorise
I. x^2 - 1 - 2y - y
II. 4(x-y)^2 - 12(x-y) + 9
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Answer:
Given (x - y)^2 - 4(x - y) - 45 can be written as
x^2 - 2xy - 4x + y^2 + 4y - 45
(x - y - 9) ( x - y + 5)
x - y = 9 (or) x - y = -5.
Step-by-step explanation:
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