Question

Desenvolva algebricamente as multiplicaçõesa) (x/2+2) (x/2-2)b) (a²+5)²c) (3b²-c)²d) (3b²-c) (3b²+c)e) (1+xy) (1-xy)

Answer 1

a) (x/2+2) (x/2-2) = x²/4 + 2² = x²/4 - 4

b) (a²+5)² = a².²  + 2a² .5 + 5² = a^4 + 10a² + 25

c) (3b²-c) = 9b^4 + 2.3b².-c + c² = 9b^4 - 6b²c + c²

d) (3b² -c) (3b²+c) = 9b^4 - c²

e) (1+xy) . (1-xy) = 1 - x²y²                    ok