(1) (x - y)2 - 9
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=(x-y)²-9
=(x-y)²-(3)²
by using formula a²-b²= (a+b)(a-b)
=therefore, (x-y+3)(x-y-3)
.......... ...answer
hope this helps you
=(x-y)²-(3)²
by using formula a²-b²= (a+b)(a-b)
=therefore, (x-y+3)(x-y-3)
.......... ...answer
hope this helps you
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