add (4x^2 - 8xy + y^2) + (-8x^2 - 9xy - y^2) + (x^2 + xy - 8y^2)

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1 Answer

add (4x^2 - 8xy + y^2) + (-8x^2 - 9xy - y^2) + (x^2 + xy - 8y^2)

 4x^2  -   8xy + y^2
-8x^2  -   9xy -  y^2
  x^2  +    xy  - 8y^2
------------------------
-3x^2  - 16xy - 8y^2
by Level 11 User (78.4k points)

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