Lucifer111
Lucifer111
17-09-2017
Mathematics
contestada
where did that underlined x go.
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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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