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Which expression is a polynomial in x but has only even powers of x?

Answer and explanation

Correct answer: x⁶ − 3x⁴ + 2x² − 8

To answer, apply two conditions: every exponent must be a non-negative integer, and every power must be even. In option A the exponents are 6, 4, 2 and 0; all are even and all are permitted in a polynomial. The constant term −8 corresponds to x⁰, and zero is even, so it does not violate the condition. Option B contains x⁵, an odd power, although the expression is a polynomial. Option C contains x⁻², a negative exponent, so it is not a polynomial. Option D contains x¹ᐟ², a fractional exponent, so it is not a polynomial. Hence option A is the only expression satisfying both requirements.

Related tags

PolynomialsEven PowersExponentsDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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