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If f(x)=3x+2 and g(x)=x−4, what is x for (f+g)(x)=0?

Answer and explanation

Correct answer: x=1/2

The governing concept is addition of functions followed by solving a linear equation. At the same input x, add the two function values: (f+g)(x)=(3x+2)+(x−4)=4x−2. The condition (f+g)(x)=0 therefore becomes 4x−2=0. Add 2 to both sides to obtain 4x=2, and divide by 4 to get x=1/2. Substitution confirms the result: f(1/2)=3/2+2=7/2, while g(1/2)=1/2−4=−7/2; their sum is zero. Thus option A is correct. Option B comes from a sign error, and options C and D do not satisfy 4x−2=0. The answer is unique because the resulting linear coefficient is nonzero.

Related tags

FunctionsSum Of FunctionsLinear EquationsAlgebraAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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