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For p(x) = x^3 - x^2 - 4x + 4, what is p(2) - p(-2)?

Answer and explanation

Correct answer: 0

The governing concept is direct evaluation of a polynomial at specified values, with careful attention to signs. At x=2, p(2)=2^3-2^2-4(2)+4=8-4-8+4=0. At x=-2, p(-2)=(-2)^3-(-2)^2-4(-2)+4=-8-4+8+4=0. Therefore p(2)-p(-2)=0-0=0, so option A is correct. The negative input must be enclosed in parentheses: (-2)^2 is 4, and -4(-2) is +8. A mistaken sign in either term can lead to options B, C, or D. In fact, the polynomial factors as (x-1)(x-2)(x+2), which independently confirms that both 2 and -2 are zeroes and that their difference is zero.

Related tags

Polynomial EvaluationZeroesSubstitutionPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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