book Maths Puzzle Numerical Ability

GCF with negative coefficient

-18m^9-27m^6-27m^2
I got the answer -3m^2 Is that right?

thank you

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book Other Question
Eliminate X3. Solve for Y.

(A-Y)*(X1-Y-X3)=B*Y
(X2-X3)*(X1-Y-X3)=C*X3

I have solved the 1st equation for Y, and the 2nd for X3. Then substituted the 2nd solution for X3 in t Graph each compound inequality.
x is greater than or equal to -2y and
x - 3y < 6


3 - x < y + 2 or
x > y + 5


Graph the absolute value inequalities.
|x + 2y| is greater