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Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer. 

y = (x^2) minus (4 times x) + c)

In the quadratic equation above, c is a constant. The graph of the equation in the x y plane contains the points (minus 2 comma 0) and (6 comma 0). What is the value of c?

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Since the graph of y = (x^2) minus (4 times x) + c) contains the point (negative 2 comma 0), it follows that substituting the value x = negative 2 into y = (x^2) minus (4 times x) +c yields y = 0.

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