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(3a^2-2a+1)(9a^2)
(27a^4-18a^3+9a^2)
B. 4a (a^2-3a+2) - 2a^2 (a+6)
4a^3-12a+8a-2a^3-12a^2
4a^3-2a^3-12a^2-12a+8a
2a^3-12a^2-4a
C. 3x (2x-4y) - (2x) (x-4y)
6x-12xy-2x^2-8xy
-2x^2+6x-12xy-8xy
-2x^2+6x-20xy
(x+1/x)(x+1/x)
x^2+x/x+x/x+1/x
x^2+x+x+1/x
x^2+2x+1/x
6a(a-3/2+a-4/3)
6a^2-18a/2+6a^2-24a/3
3a^2-9a+2a^2-8a
3a^2+2a^2-9a-8a
5a^2-17a