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Which expression is a polynomial in (x) and has all non-zero variable powers even?

Answer and explanation

Correct answer: (x^6-3x^4+2x^2-5)

A polynomial in \(x\) may have powers such as 0, 1, 2, 3, and so on, but not negative or fractional powers. The question adds another condition: every non-zero power of the variable must be even. In option A, \(x^6-3x^4+2x^2-5\), the powers are 6, 4, 2, and 0. The non-zero powers 6, 4, and 2 are all even, and the constant term has power 0.

Option B contains odd powers 5 and 3, so it fails the even-power condition. Option C contains the negative power \(x^{-2}\), so it is not a polynomial. Option D contains the fractional power \(x^{1/2}\), so it is also not a polynomial. Therefore option A is the only expression satisfying both requirements. The supplied answer and explanation are correct.

Related tags

Definition-PolynomialEven-PowersValid-Polynomial

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