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What is the expression (\sqrt{x}+5x^2)?

Answer and explanation

Correct answer: Not a polynomial

A polynomial in \(x\) can contain only non-negative integer powers of \(x\). Its terms may have coefficients and may be combined by addition or subtraction, but fractional powers such as \(x^{1/2}\) are not allowed in a polynomial. Since \(\sqrt{x}=x^{1/2}\), the first term in \(\sqrt{x}+5x^2\) has a fractional exponent.

Although \(5x^2\) by itself is a quadratic polynomial, adding \(\sqrt{x}\) makes the complete expression fail the polynomial definition. It is therefore not a polynomial, and it cannot be classified as linear or quadratic. It is also not constant because it changes with x. Hence option C is correct. The supplied explanation identifies the fractional power precisely and gives the correct conclusion.

Related tags

PolynomialSquare RootNon Polynomial

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