Verified Answer :

apologiabiology

remember distributive property, but reverse it
ab-ac=a(b-c)
a is a common factor


find common factors
factor each
9x^2=33xx
6xy=23xy
common factor is 3*x or 3x

9x^2-6xy=3x(3x)-3x(2y)=3x(3x-2y)

factored form is 3x(3x-2y)

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