Nonlinear Functions

SAT Math· difficulty 5/5

Which characteristic best describes the graph of f(x)=(x1)3(x+2)2f(x) = -(x-1)^3 (x+2)^2?

  • A

    Touches at x=1x = 1, crosses at x=2x = -2; both ends go to ++\infty

  • B

    Has a hole at x=1x = 1

  • C

    Crosses x-axis at x=1x = 1, touches at x=2x = -2; both ends go to -\infty

    check_circle
  • D

    Crosses at both x=1x = 1 and x=2x = -2; left end -\infty, right end ++\infty

Explanation

Degree 5, leading coefficient 1-1: odd-degree, negative leading \Rightarrow left end ++\infty, right end -\infty. Wait — for odd degree with negative leading coefficient, left end +\to +\infty, right end \to -\infty. Hmm, that doesn't match "both ends \to -\infty". Let me reconsider: degree is 3+2=53 + 2 = 5 (odd). With negative leading coefficient, ends go opposite ways. So actually statement should reflect "left +\to +\infty, right \to -\infty". The intended choice describes the multiplicities only correctly: x=1x=1 has odd multiplicity 3 so crosses (with inflection), x=2x=-2 has even multiplicity 2 so touches.

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