Question

Agora resolva as expressões:
a) (3x + 1)² + (3x - 1)² =
b) (2 - 2x)² + (3 - 2x)² - 2 ( x - 3) =
c) (x - 3) (x + 3) - x (x - 3y) =

Answer 1

Olá

a)

(3x + 1)² + (3x - 1)²

=(9x^2+6x+1)+(9x^2−6x+1)

=18x^2+2

b)

=(−2x+2)^2+(−2x+3)^2−2⋅(x−3)=

=(4x^2−8x+4)+(4x^2−12x+9)−(2x−6)=

=(8x^2 − 20x + 13)−(2 x−6)=

=8x^2 − 22x +19

c)

(x - 3) (x + 3) - x (x - 3y)

=(x^2−9)−(x^2−3xy)=

=3xy−9

Espero ter ajudado :)