Respostas

2014-08-21T19:33:38-03:00
 x^{4}  -y^{4}  +2x³y -2xy³
(x² + y²) (x² - y²) + 2x .(x²y - y³)
(x² + y²) . (x + y) . (x - y) + 2xy . (x² - y²)
(x² + y²) . (x + y) . (x - y) +
2xy . (x + y) . (x + y)
(x² + y² + 2xy) . (x + y) . (x - y)
(x + y)² . (x + y) . (x - y)
(x + y)³ . (x - y)

4 2 4