Respostas

2013-05-01T20:22:51-03:00

( x + 3y) ² = x² +6xy + 9y²

(-y + 3) ³ = ( -y + 3)² . ( -y + 3) = (y² -6y +9). (-y + 3) = -y³ +6y² -9y +3y² - 18y + 27 = -y³ +9y² - 27y +27

 

x² + 6xy + 9y² + 6x - y = 4x ( -y³ + 9y² - 27y + 27)

x² + 6xy + 9y² + 6x - y = -4xy³ + 36xy² - 108 xy + 108 x 

x² + 6xy + 108xy +9y² + 6x - 108 x - y + 4xy³ - 36xy² = 4xy³ -36xy² +x² +9y² +114xy - 102x - y