One of the roots of the equation $$x^2$$+kx-6=0 is 3, and k is a

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One of the roots of the equation $$x^2$$+kx-6=0 is 3, and k is a constant.

Quantity A:k

Quantity B:-1

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、 The relationship cannot be determined from the information given.

答案：C

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