Question :

Holly finds that (11m 13n + 6mn) (10m 7n + 3mn) = m 20n + 9mn. What error did Holly make? A.) She only used the additive inverse of 10m when combining like terms. B.) She added the polynomials instead of subtracting. C.) She only used the additive inverses of 7n and 3mn when combining like terms. D.) She did not combine all like terms.

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