the expression is$\displaystyle 6a^2-a-2$

now this is what ive done.......

taken out the common factor of -ve.

1.$\displaystyle -(6a^2+a+2)$

2. $\displaystyle -[(6a^2+a+12)]$

3. $\displaystyle -[(6a^2+4a-3a+12)]$

4. $\displaystyle -[2a(3a+2)-3(a-4)]$