9b(b-1)-(3b+2)^2=...................
9b(b-1)-(3b+2)^2=9b^2-9b-9b^2-12b-4=-21b-4
9b^2 - 9b - 9b^2 - 12b - 4 = -21b - 4
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9b(b-1)-(3b+2)^2=9b^2-9b-9b^2-12b-4=-21b-4
9b^2 - 9b - 9b^2 - 12b - 4 = -21b - 4