find each sum (x^2+y^2)+(-x^2+y^2)?

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2007-10-08 00:00:27 · 3 answers · asked by porcha b 1 in Science & Mathematics ➔ Mathematics

(x^2+y^2)+(-x^2+y^2)
=x^2+y^2-x^2+y^2
=2y^2

2007-10-08 00:04:36 · answer #1 · answered by uday k 2 · 0⤊ 0⤋

x^2 + y^2 - x^2 + y^2 = 2 y^2

Remember that + of - or - of + is -. So the x^2 terms get cancelled.

2007-10-08 07:04:54 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋

(x^2+y^2)+(-x^2+y^2)
=2y^2

2007-10-08 07:06:04 · answer #3 · answered by jackleynpoll 3 · 0⤊ 0⤋