Q.1.1
[tex]4m - n + 8n - 9m \\ 4m - 9n - 9m \\ = - 5m - 9n[/tex]
Q 1.2
[tex]ab + ( {a}^{2} - 2b)[/tex]
this can't be simplified.
Q. 1.3
[tex]4d - d(2d + 2) \\ 3d \times 2d + 2 \\ = 6d + 2[/tex]
Q.1.4
[tex]4(b - 2) + 6(b - 1) \\ 4b - 8 + 6b - 6 \\ = 10b - 2[/tex]
