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Why will \(\frac{x^4-1}{x^2}\) not remain a polynomial after simplification?

Answer and explanation

Correct answer: Because it becomes \(x^2-\frac{1}{x^2}\)

To simplify the fraction, divide each term in the numerator by x squared: \\(x^4/x^2=x^2\\) and \\(-1/x^2=-1/x^2\\). Therefore, for x not equal to zero, the expression becomes \\(x^2-1/x^2\\), or equivalently \\(x^2-x^{-2}\\). A polynomial cannot contain a negative power of its variable.

The presence of subtraction is not a problem, because polynomials may have both positive and negative coefficients. The term x to the fourth power is also completely valid, and the constant 1 is valid. The real difficulty is the denominator x squared, which creates the negative exponent. Hence option A gives the correct reason that the simplified expression is not a polynomial.

Related tags

Definition-PolynomialSimplificationNegative-Power

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