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With respect to (z), what is the degree of (6x^2z^7-4xz^5+3x^4-9)?

Answer and explanation

Correct answer: (7)

When a polynomial is considered with respect to \(z\), the degree is found by comparing only the exponents of \(z\). Any power of \(x\) is part of the coefficient from this viewpoint. Terms without \(z\), such as \(3x^4\) and \(-9\), have degree zero in \(z\), regardless of the power of \(x\) appearing in them.

In \(6x^2z^7-4xz^5+3x^4-9\), the powers of \(z\) are \(7\), \(5\), \(0\), and \(0\), respectively. The first term has the greatest \(z\)-power, namely \(7\), and its coefficient \(6x^2\) is non-zero. Therefore the degree with respect to \(z\) is \(7\), which is option C. It would be incorrect to choose \(9\) by combining exponents from different variables.

Related tags

PolynomialDegree In ZVariables

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