Lucifer111
Lucifer111 Lucifer111
  • 17-09-2017
  • Mathematics
contestada

where did that underlined x go.

where did that underlined x go class=

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Catya
Catya Catya
  • 17-09-2017
they completed the square by both adding and subtracting 2x^2y^2.

x^4 + x^2y^2 + y^4

(x^4 + 2x^2y^2 +y^4) - 2x^2y^2 + x^2y^2
(x^2 + y^2)^2 - 2x^2y^2 + x^2y^2
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