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If p(x)=x^4-5x^2+4, which value is not a zero of p(x)?

Answer and explanation

Correct answer: 3

The governing concept is that a zero of a polynomial is a value that makes its output equal to zero. Factor the polynomial by treating it as a quadratic in x^2: x^4-5x^2+4=(x^2-1)(x^2-4)=(x-1)(x+1)(x-2)(x+2). Thus its real zeroes are 1, -1, 2, and -2. Among the listed choices, 1, -1, and 2 are genuine zeroes because one factor becomes zero for each of them. For the remaining choice, p(3)=3^4-5(3^2)+4=81-45+4=40, which is not zero. Therefore 3 is not a zero, so option D is correct. The factorisation also provides a complete check rather than relying on only one substitution.

Related tags

PolynomialsZeroesFactorisationPolynomials In One VariableMathematicsClass 10 Mcq

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