smithtrinity14 smithtrinity14
  • 03-04-2020
  • Mathematics
contestada

Which expression is equivalent to (x + y)(x – y)?

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erin1410 erin1410
  • 03-04-2020
x^2-y^2
you would get x^2+xy-xy+y^2
the xy and -xy cancel
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DeanR
DeanR DeanR
  • 03-04-2020

We can't see any choices but it doesn't matter.  That's the factorization of the difference of two squares.  It's important to recognize either side when you see it; the usual next move is to replace it with the other side.

(x + y)(x – y) = x² - y²

Answer: x² - y²

Answer Link

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