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If (e=0), what is the degree of (ex^9+(e-2)x^7+5x^2-1)?

Answer and explanation

Correct answer: (7)

A parameter multiplying the highest power may make that term disappear. Therefore, one must substitute the given value and inspect the remaining terms before stating the degree. The degree is the greatest exponent with a non-zero coefficient, not necessarily the greatest exponent written in the original expression.

For \(e=0\), the coefficient of \(x^9\) is zero, so \(ex^9=0\). The coefficient of \(x^7\) is \(e-2=0-2=-2\), which is non-zero. The expression becomes \(-2x^7+5x^2-1\). Its highest non-zero power is 7, so option B is correct. The term \(5x^2\) and the constant do not change the answer because their powers are lower. Option A incorrectly counts the vanished ninth-degree term.

Related tags

PolynomialParameter SubstitutionDegree

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