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If f(x)=2x-1 and g(x)=5-x, then what type of function is (f+g)(x)?

Answer and explanation

Correct answer: Linear function

The sum of two functions is formed by adding their expressions: \\((f+g)(x)=f(x)+g(x)\\). After this addition, the type of function is identified from the simplified expression. A linear function has the form \\(ax+b\\), where the highest power of \\(x\\) is one. A constant function has no variable term, while a quadratic function contains \\(x^2\\).

Substitute the given rules: \\((f+g)(x)=(2x-1)+(5-x)\\). Combine like terms: \\(2x-x=x\\), and \\(-1+5=4\\). Hence \\((f+g)(x)=x+4\\). This has the form \\(ax+b\\) with \\(a=1\\), so it is a linear function. Therefore option A is correct. It is not constant because the term \\(x\\) remains, and it is not quadratic because no \\(x^2\\) term appears.

Related tags

Algebra Of Real FunctionsFunction AdditionFunction ClassificationRelations And FunctionsMathematicsClass 11 Mcq

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