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If the degree of p(x) = mx^5 + (m - 4)x^4 + 3x^2 + 1 is 4, what is m?

Answer and explanation

Correct answer: 0

The governing concept is that the degree of a nonzero polynomial is the greatest exponent with a nonzero coefficient. To make the degree equal to 4, the coefficient of x^5 must be zero, so m=0. We must then verify that the x^4 coefficient remains nonzero: m-4=0-4=-4, which is indeed nonzero. Therefore the x^4 term remains and the degree is exactly 4. Option A is correct. If m=4, the x^4 coefficient would vanish, but the x^5 term would have coefficient 4, giving degree 5. If m=2, the x^5 coefficient would still be nonzero, also giving degree 5. Thus both the removal of the fifth-degree term and survival of the fourth-degree term must be checked.

Related tags

Degree Of PolynomialCoefficientsPolynomial ExpressionsPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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