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The function f is defined for all numbers x by f(x)=57x2-kx+925, where k is a constant, and f(x)=f(-x) for all x.
Quantity A: k
Quantity B:0
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AQuantity A is greater.
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BQuantity B is greater.
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CThe two quantities are equal.
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DThe relationship cannot be determined from the information given.
C显示答案