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For the function f(x) = sgn(x), what is the value of f(x) at x = 0?

Answer and explanation

Correct answer: 0

The governing concept is the piecewise definition of the signum, or sign, function. It is given by sgn(x) = 1 when x > 0, sgn(x) = 0 when x = 0, and sgn(x) = -1 when x < 0. Since the question specifically gives x = 0, the middle case applies directly: f(0) = sgn(0) = 0. Therefore option B is correct. The value 1 belongs to positive inputs, while -1 belongs to negative inputs. The function is not undefined at zero under its standard definition; zero is deliberately assigned as its output. Graphically, the two horizontal branches lie at y = 1 and y = -1, with the origin included at y = 0.

Related tags

Standard-FunctionsSignum-FunctionGraphsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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