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The degree of (-9x^7+4x^5-x+8) is decided by which term?

Answer and explanation

Correct answer: (-9x^7)

A polynomial’s degree is found by identifying the largest exponent attached to the variable in a nonzero term. The coefficient may be positive or negative, but that sign does not affect the exponent. Constant terms have exponent zero, so they are considered only when no variable term has a larger power. Here, the term with the greatest power is \(-9x^7\), making option A correct.

The powers in the polynomial are 7, 5, 1, and 0. Since \(-9\) is nonzero, the term \(-9x^7\) is present and its exponent is 7. The other variable terms have smaller exponents, and 8 is a constant. Thus the degree is 7 and is decided by \(-9x^7\). A negative coefficient does not make the term invalid and does not lower its degree.

Related tags

PolynomialLeading TermDegree

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