Question

A multiplicação entre (-xy).( 4x² - 7y² + 5xy - 16)

Answer 1

Oie, Td Bom?!

$= ( - xy) \: . \: (4x {}^{2} - 7y {}^{2} + 5xy - 16)$

$= - xy \: . \: (4x {}^{2} - 7y {}^{2} + 5xy - 16)$

$= - xy \: . \: 4x {}^{2} - xy \: . \: ( - 7y {}^{2} ) - xy \: . \: 5xy - xy \: . \: ( - 16)$

$= - 4x {}^{3} y + 7xy {}^{3} - 5x {}^{2} y {}^{2} + 16xy$

Att. Makaveli1996