Question

calcule: a)(x+7).(x+5)=
b)(y-6).(y+5)=
c)(3a-1,5x).(0,7a-5x)=
d)(a²-1).(2a²-2a+1)=​

Answer 1

Resposta:

Explicação passo a passo:

Calcule:

a)(x+7).(x+5)=

= x^2 + 5x + 7x + 35

= x^2 + 12x + 35

__________________

b)(y-6).(y+5)=

= y^2 + 5y - 6y - 30

= y^2 - y - 30

_________________

c)(3a - 1,5x).(0,7a - 5x)=

= 3a.0,7.a - 3a.5x - 1,5.x.0,7a + 1,5.x.5.x

= 2,1a^2 - 15ax - 1,05ax + 7,5 x^2

= 2,1a^2 - 16,05 ax + 7,5 x^2

____________

d)(a²-1).(2a²-2a+1)

= 2a^4 - 2a^3 + a^2 - 2a^2 + 2a - 1

= 2a^4 - 2a^3 - a^2 + 2a - 1