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If p(x) = 2x^2 - 5x + 3, what is p(x + 2) - p(x)?

Answer and explanation

Correct answer: 8x - 2

The governing concept is substitution into a polynomial, followed by careful simplification and subtraction. First calculate p(x+2)=2(x+2)^2-5(x+2)+3. Since (x+2)^2=x^2+4x+4, this becomes 2x^2+8x+8-5x-10+3=2x^2+3x+1. Now subtract the original polynomial: p(x+2)-p(x)=(2x^2+3x+1)-(2x^2-5x+3). Combining like terms gives 2x^2-2x^2+3x+5x+1-3=8x-2. Thus option A is correct. Option B comes from mishandling the constants, while options C and D lose a factor of 2 in the linear term. The result is a polynomial, not a single numerical value, because x remains a variable.

Related tags

Polynomial SubstitutionAlgebraic SimplificationPolynomialsPolynomials In One VariableMathematicsClass 10 Mcq

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