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What is f(x) = 7x2 + 42x written in vertex form?A. f(x) = 7(x + 6)2 - 6B. f(x) = 7(x + 6)2 - 42C. f(x) = 7(x + 3)2 - 9D. f(x) = 7(x + 3)2 - 63
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