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

Answer and explanation

Correct answer: (6)

A degree taken with respect to one variable counts only that variable’s exponent. Here the polynomial is being considered as a polynomial in \(z\), so expressions involving \(x\) serve as coefficients. The exponent of \(x\) does not increase the degree in \(z\). Constant terms with no \(z\) have \(z\)-degree zero.

The terms have the following powers of \(z\): \(5x^3z^6\) has power \(6\), \(-7x^2z^4\) has power \(4\), \(9x\) has power \(0\), and \(-2\) has power \(0\). The greatest power is therefore \(6\), and its coefficient \(5x^3\) is non-zero in this context. Thus option C, degree \(6\), follows.

Related tags

PolynomialDegree In ZVariables

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