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If \(a=0\) and \(b\neq0\), what will be the degree of \(ax^7+bx^3+2\)?

Answer and explanation

Correct answer: 3

When \(a=0\), the term \(ax^7\) becomes zero. The polynomial is then \(bx^3+2\). Since \(b\neq0\), the coefficient of \(x^3\) is non-zero, so the highest remaining power of \(x\) is 3. Hence, its degree is 3. Option 2 may seem tempting because of the constant \(2\), but a non-zero constant has degree 0. Exam tip: Remove terms with zero coefficients before identifying the highest exponent.

Related tags

PolynomialsDegree Of PolynomialZero CoefficientAlgebraClass 9 MathematicsDegree Of A PolynomialIntroduction To PolynomialsMathematics

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