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Answer: A (-15)
Explanation:
Expanding the right side,
4x^2 + mx + 9 = 4x^2 + 4nx +n^2
Comparing both sides, we see that
9 = n^2
m = 4n
Therefore, n = -3 and m = 4(-3) = -12
m + n = -3 + (-12) = -15
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