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If a is not equal to 0 and b = 0, what will be the degree of ax^4 + bx^6 + 3?

Answer and explanation

Correct answer: 4

The degree of a non-zero polynomial is the greatest exponent of x whose coefficient is non-zero. Substitute b = 0 into the expression: ax^4 + bx^6 + 3 becomes ax^4 + 0x^6 + 3, or simply ax^4 + 3. Since a is not equal to zero, the x^4 term remains and has a non-zero coefficient. The x^6 term disappears because its coefficient b is zero. Therefore the greatest remaining power is 4, so option B is correct. Option C incorrectly uses the original largest exponent even though its term vanishes. Option D wrongly adds exponents, and option A would apply only to a non-zero constant polynomial, which this is not.

Related tags

PolynomialDegreeParameter-SubstitutionDegree Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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