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For p(x)=x^3+2x^2-4x-8, what is p(2)-p(-2)?

Answer and explanation

Correct answer: 0

The governing concept is evaluation of a polynomial at specified values, with special care for signs when the input is negative. Substituting x=2 gives p(2)=2^3+2(2^2)-4(2)-8=8+8-8-8=0. Substituting x=-2 gives p(-2)=(-2)^3+2(-2)^2-4(-2)-8=-8+8+8-8=0. Consequently p(2)-p(-2)=0-0=0, so option A is correct. A structural check is also possible: p(x)=x^3+2x^2-4x-8=(x+2)^2(x-2), so both 2 and -2 are zeroes. Option C usually comes from mishandling the negative input or from subtracting an incorrect value, while B and D have no support after correct evaluation. Both methods confirm the same answer.

Related tags

Polynomial EvaluationZeroesSignsFactorisationPolynomials In One VariablePolynomialsMathematicsClass 10 Mcq

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