The solutions to a quadratic equation are x = 2 and x = 7. if k is a nonzero constant, which of the following must be equal to the quadratic equation?

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answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

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