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In the xy-plane, the point (2, 5) lies on the graph of the function f. If f (x) = k − x2, where k is a constant, what is the value of k?
    Correct answer is '9'. Can you explain this answer?
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    In the xy-plane, the point (2, 5) lies on the graph of the function f....
    Since the point (2, 5) lies on the graph of y = f(x) in the xy-plane, the ordered pair (2, 5) must satisfy the equation y = f(x). That is, 5 = f(2), or 5 = k − 22. This equation simplifies to 5 = k − 4. Therefore, the value of the constant k is 9. 
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    In the xy-plane, the point (2, 5) lies on the graph of the function f. If f (x) = k − x2, where k is a constant, what is the value of k?Correct answer is '9'. Can you explain this answer?
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