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For which value will the degree of ((2a+6)x^4+5x^2-1) be (2)?

Answer and explanation

Correct answer: \(a=-3\)

For the polynomial to have degree 2, the coefficient of \(x^4\) must be zero, while the coefficient of \(x^2\), which is 5, remains non-zero. Thus, \(2a+6=0\) gives \(a=-3\). If \(a=-6\), the coefficient of \(x^4\) is \(-6\), so the degree remains 4. Exam tip: In a polynomial with a parameter, first check the coefficient of the highest power.

Related tags

PolynomialsDegree Of PolynomialParameterAlgebraClass 9Definition Of A PolynomialIntroduction To PolynomialsMathematics

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