Question

RESOLVA: a) ( a4 - xy)²
b) ( 4 - xy)²

Answer 1

$(a^{4} - xy)^{2}$

$(a^{4} - xy).(a^{4} - xy)$

$a^{8}-a^{4}xy-a^{4}xy+x^{2}y^{2}$

$a^{8}-2a^{4}xy+x^{2}y^{2}$

》》》》》》》》》》》》》》》》

$(4-xy)^{2}$

$(4-xy).(4-xy)$

$16-4xy-4xy+x^{2}y^{2}$

$16-8xy+x^{2}y^{2}$