Question

8) Assinale cada item correto. Justifique sua resposta através de cálculos

Answer 1

Resposta:

Olá!

Explicação passo a passo:

a) $(x-8)^2=(x-8).(x-8)$

$(x-8)^2=x^2-8x-8x+64$

$(x-8)^2=x^2-16x+64$

b) $(\frac{m}{2} +5)^2=(\frac{m}{2} +5).(\frac{m}{2} +5)$

$(\frac{m}{2} +5)^2=\frac{m^2}{4} +\frac{5m}{2} +\frac{5m}{2} +25$

$(\frac{m}{2} +5)^2=\frac{m^2}{4} +\frac{10m}{2} +25$

$(\frac{m}{2} +5)^2=\frac{m^2}{4} +5m +25$

c) $(3a-b).(b+3a)=3ab+9a^2-b^2-3ab$

$(3a-b).(b+3a)=9a^2-b^2$

d) $(6+r).(3-r)=18-6r+3r-r^2$

$(6+r).(3-r)=18-3r-r^2$

Bons Estudos!