math,correction

Multiply. (x+2)(x-2)

my answer is: x^2-4

Factor completely. 3(x-2)^2-3(x-2)-6

MY answer: 3(x-4)(x-1)

Factor 9x(x-7y)-6(x-7y)

My answer is: (9x-6)(x-7y)

Divide: (x^3+2x^2+x+12)/(x+3)

My anwer is: x^2-x+4

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