Hi... tolong dong Yg no.8 dan 9 makasih~

8][
f(g(x)) = g(f(x))
x² - 7x + 6 + 2 = (x + 2)² - 7(x + 2) + 6
x² - 7x + 8 = x² - 3x - 4
-7x + 3x = -8 - 4
-4x = -12
x = 3

9][
f(g(x)) = g(f(x))
3(4x + n) - 10 = 4(3x - 10) + n
12x + 3n - 10 = 12x - 40 + n
3n - n = 10 - 40
2n = -30
n = -15