Mark M. answered 09/14/20
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Retired math prof. Calc 1, 2 and AP Calculus tutoring experience.
limh→0 [((-3+h)2 - 9) / h] = limh→0 [(9 - 6h + h2 - 9) / h] = limh→0 [(h(h - 6) / h] = limh→0 [h - 6] = -6