minta tolong no 9 dan 10 itu kak makasih maaf repot

[tex]No. \: 9[/tex]

3x(x - 3) - 2x(x + 1) + (2x - 2)
= 3x² - 9x - 2x² - 2x + 2x - 2
= x² - 9x - 2

[tex]No. \: 10[/tex]

f(x) = 5x - 2
f(a) = -12

5a - 2 = -12
5a = -12 + 2
5a = -10
a = -10 ÷ 5
a = -2.