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If f(x) = 4x + 6, what will (1/2 f)(x) be?

Answer and explanation

Correct answer: 2x + 3

The notation (1/2 f)(x) means that the function f is multiplied by the scalar 1/2; it does not mean that the input x is replaced by x/2. Therefore, apply 1/2 to the complete function value: (1/2 f)(x) = (1/2)f(x) = (1/2)(4x + 6). Distributing the scalar gives (4x)/2 + 6/2 = 2x + 3. Hence option A is correct. Option B divides only the constant term, option C leaves the constant unchanged, and option D doubles both terms instead of multiplying them by one-half. The governing concept is scalar multiplication of a real-valued function, where every term in the output is multiplied by the same scalar.

Related tags

Algebra-Of-FunctionsScalar-MultiplicationReal-FunctionsAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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