Make the function y = f (x) = 100, X is contained in the image of R, and find the detailed solutions of F (- 10), f (0), f (1000). Thank you

The image is a straight line parallel to the X axis, intersecting the Y axis at 100, f (- 10) = f (1000) = 100, because the analytic expression of the function is y = f (x) = 100, X is an independent variable, and no matter what it is, it must satisfy f (x) = 100

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