Tentukan hasil dari No 31-35

no. 31
[tex] = {6x}^{2} - 21x + 2x - 7 \\ = {6x}^{2} - 19x - 7[/tex]
no. 32
[tex] = {12a { }^{2} } - 2a - 30a + 5 \\ = {12a}^{2} - 32a + 5[/tex]
no. 33
2x^2-x-10/x+2
[tex] \frac{ {2x}^{2} - x - 10 }{x + 2} \\ = \frac{ {2x}^{2} + 4x - 5x - 10 }{x + 2} \\ = \frac{2x(x + 2) - 5( \times + 2)}{x + 2} \\ = \frac{(2x - 5)(x + 2)}{x + 2} \\ = 2x - 5[/tex]
maaf, no 34 dan 35 gak jelas soalnya