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If f(x)=x² and g(x)=1/x, which equation is obtained from (f+g)(x)=2?

Answer and explanation

Correct answer: x³−2x+1=0, x ≠ 0

The governing concept is transforming a function equation into a polynomial equation without losing the original domain restriction. Since f(x)+g(x)=x²+1/x, the given condition is x²+1/x=2, where x≠0 because g is undefined at zero. Multiply the equation by x, which is legitimate under that restriction: x³+1=2x. Bringing every term to the left gives x³−2x+1=0. Hence option A is correct. Option B does not have the cubic term produced when the fraction is cleared. Option C changes the sign of 2x, and option D changes the sign of the constant 1. The condition x≠0 must also be retained because multiplying can otherwise conceal the original domain issue.

Related tags

FunctionsFunction EquationsDomainPolynomial TransformationAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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