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If (p(x)=x^2-4x+6), what is the value of (p(x+1)-p(x))?

Answer and explanation

Correct answer: (2x-3)

The direct answer is option A: \(2x-3\). Substitute \(x+1\) into the polynomial: \(p(x+1)=(x+1)^2-4(x+1)+6=x^2+2x+1-4x-4+6=x^2-2x+3\). Now subtract \(p(x)=x^2-4x+6\): \(p(x+1)-p(x)=(x^2-2x+3)-(x^2-4x+6)=2x-3\). The \(x^2\) terms cancel. Option A is therefore correct. Option B, \(2x+3\), has the wrong constant sign. Option C, \(x-3\), misses a factor of 2 in the linear term. Option D, \(x^2-3\), incorrectly leaves a quadratic term after cancellation. The safest method is to calculate the shifted polynomial fully, place brackets around the expression being subtracted, and then combine like terms. Memory cue: replacing \(x\) by \(x+1\) means every occurrence of \(x\) changes, not just one term.

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