9(a-1)^2-(3a+2)(3a-2)
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9(a-1)^2-(3a+2)(3a-2)9(a-1)^2-(3a+2)(3a-2)9(a-1)^2-(3a+2)(3a-2)9a*2-18a+9-9a*2+6a-6a+4=13-18a
9(a-1)^2-(3a+2)(3a-2)
9(a-1)^2-(3a+2)(3a-2)
9(a-1)^2-(3a+2)(3a-2)
9a*2-18a+9-9a*2+6a-6a+4
=13-18a
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