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The degree of −2x^8 + 5x^6 − x^2 + 4 is decided by which term?

Answer and explanation

Correct answer: −2x⁸

For a non-zero polynomial in one variable, the degree is the greatest exponent of the variable attached to a non-zero coefficient. The exponents in −2x^8 + 5x^6 − x^2 + 4 are 8, 6, 2, and 0; the constant 4 may be viewed as 4x^0. The largest exponent is 8, and its coefficient −2 is non-zero. Thus the leading term −2x^8 determines the degree, so option A is correct. The negative sign changes the coefficient but has no effect on the exponent or degree. The terms 5x^6 and −x^2 have smaller exponents, while the constant 4 has degree zero. None of those terms can determine the polynomial’s degree.

Related tags

Degree Of PolynomialLeading TermPolynomial ExponentsClass 9MathematicsDegree Of A PolynomialIntroduction To PolynomialsClass 9 Mcq

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