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Mathematics
Gina
13 October, 22:24
What's [ (x-y) + 7] times [ (x-y) - 7]?
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Kaia Oneill
13 October, 23:56
0
Step-by-step explanation:
Let z = x - y
The given expression translates into
(z + 7) (z - 7) which is going to give you the difference of squares.
z^2 - 49
Now you need to know what z^2 is
z = x - y
z^2 = x^2 - 2xy + y^2
So the answer becomes
x^2 - 2xy + y^2 - 49
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