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If f(x) = 3x and g(x) = x + 1, what is (f − g)(x)?

Answer and explanation

Correct answer: 2x − 1

The governing concept is subtraction of functions, which is defined pointwise as (f − g)(x) = f(x) − g(x). Substitute the given expressions: (f − g)(x) = 3x − (x + 1). The parentheses are essential because the minus sign applies to both terms inside g(x). Distribute the subtraction: 3x − x − 1 = 2x − 1. Thus option A is correct. Option C results from failing to change the sign of the constant, option B adds the functions instead of subtracting them, and option D incorrectly multiplies expressions and introduces a square. The final expression is linear, as expected from subtracting two linear functions.

Related tags

Difference Of FunctionsFunction OperationsLinear ExpressionsFunctionsRelations And FunctionsMathematicsClass 12 Mcq

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