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If (e=2), what is the degree of ((e-2)x^{10}+(e+1)x^8+4x^3-6)?

Answer and explanation

Correct answer: (8)

As with any polynomial containing a parameter, first substitute the given value and then remove terms whose coefficients become zero. The highest displayed exponent is not automatically the degree. Here, the coefficient of \(x^{10}\) is \(e-2\), which becomes zero when \(e=2\). The next highest nonzero power is 8, so option B is correct.

Substitute \(e=2\): \((e-2)x^{10}=(2-2)x^{10}=0\), while \((e+1)x^8=(2+1)x^8=3x^8\). The polynomial becomes \(3x^8+4x^3-6\). Its greatest exponent in a nonzero term is 8, so its degree is 8. The term of degree 10 disappears, and therefore option A is not valid.

Related tags

PolynomialParameter SubstitutionDegree

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