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Factor " a 'squared' - (x+y) 'squared'

i don't want this just because i want to cheat. I need to know HOW to get this answer...I totally forgot from last year XD help please

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a^2 - (x + y)^2. You have to recognize this as The Difference of 2 Squares
which always factors the same way.
Examples:
1). A^2 - B^2 = (A + B)(A - B)
2). m^2 - 9 = (m + 3)(m - 3)
For our problem the answer is
(a + (x+y)) + (a - (x+y)). =
(a + x + y)(a - x - y). ANSWER

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first add negative x+y the square it

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im sorry, i am horrid at math... can you explain that further?
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lol ok, add -x + -y then square it.......if you still dont get then give me an example for what x equals and y equals
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Not right , sorry.
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Opening the brackets would give you, (a-x-y)(a=x=y). This is from the principle that a^2 - b^2 = (a-b) (a+b). Thus replacing the two values gives the solution.

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