Question

Desenvolva os produtos notáveis

a) (x+7).(x-7)=

b) (3x-5.(3x+5)=

C)(4c+7y).(4x7y)=

j) (9a+c^4).(9a-c^4)=

Answer 1

a) (x+7).(x-7)=

x.x+7.x-7.x+7.(-7)

x^2+7x-7x-49

x^2-49

b) (3x-5).(3x+5)=

3x.3x+3x.5+3x.(-5)+5.(-5)

9x^2+15x-15x-25

9x^2-25

C)(4c+7y).(4x+7y)=

16cx+28cy+28xy+49y^2


j) (9a+c^4).(9a-c^4)=

81a^2-9ac^4+9ac^4-c^8

81a^2-c^8