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With respect to (z), what is the degree of (4x^2z^5-3xz^3+8x-1)?

Answer and explanation

Correct answer: (5)

The phrase “with respect to \(z\)” means that only the powers of \(z\) are used to determine the degree. The other symbols, such as \(x\), are treated as coefficients while viewing the expression as a polynomial in \(z\). Therefore powers of \(x\) must not be added to powers of \(z\), and the total degree in all variables is a different question.

Inspect the terms according to their powers of \(z\): \(4x^2z^5\) has \(z\)-power \(5\), \(-3xz^3\) has power \(3\), \(8x\) has power \(0\), and \(-1\) also has power \(0\). The largest of these is \(5\), with a non-zero coefficient \(4x^2\). Hence the degree with respect to \(z\) is \(5\), so option C is correct.

Related tags

PolynomialDegree In ZVariables

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