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Answer:
It is option D
Step-by-step explanation:
(x-y)(x^2-1)-x-y
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Answer:
C) x²-xy-4x+4y
Step-by-step explanation:
x²-xy-4x+4y
= x(x-y) -4(x-y)
= (x-4)(x-y)
it's clear from above that (x-y) is factor of x²-xy-4x+4y
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