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Which of the following expressions is a polynomial of degree 4 in \(x\)?

Answer and explanation

Correct answer: \(7x^4-3x+2\)

In a polynomial, every exponent of \(x\) must be a non-negative integer. In \(7x^4-3x+2\), the highest exponent is 4, so it is a polynomial of degree 4. Option B has highest exponent 5. Option C contains \(\sqrt{x}=x^{1/2}\), and option D contains an \(x^{-1}\) term, so neither is a polynomial. Exam tip: first check that all exponents are non-negative integers, then use the highest exponent to find the degree.

Related tags

PolynomialsAlgebraic ExpressionsDegree Of PolynomialClass 9 MathematicsExponentsIntroduction To PolynomialsMathematicsClass 9 Mcq

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