Question

(9 / 3x + 3) * (x² - 1 / 6)

Answer 1

(9 / 3x + 3) * (x² - 1 / 6)=

(9x^2-9)/(18x+18)=
9*(x^2-1) / 9*(2x+2)=
(x^2-1)/2(x+1)=
(x+1)*(x-1) / 2*(x+1)=
(x-1)/2