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What are the x-values of the intersections of f(x)=x^3 and g(x)=4x?

Answer and explanation

Correct answer: x=-2, x=0, and x=2

At an intersection, both functions have the same y-value for the same x, so solve x^3=4x. Move all terms to one side: x^3−4x=0. Factorising gives x(x^2−4)=0, and the difference of squares gives x(x−2)(x+2)=0. Therefore the three real solutions are x=−2, x=0, and x=2. Substitution confirms them: at x=2, both functions equal 8; at x=−2, both equal −8; and at x=0, both equal 0. Hence option A is correct. Option B corresponds to an incorrect factor x^2−1. Option C treats the coefficient 4 as a root, and option D ignores the two nonzero solutions.

Related tags

Cubic-FunctionsGraph-IntersectionFactorisationGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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