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Knewton Challenge Discussion – GMAT Data Sufficiency (Graph Intersect)

Posted in Test Prep on March 3, 2011 by



This is a tricky Data Sufficiency question that over 50% of students miss. Can you tackle it?

Try it out, then leave your answer in the comments. When you’re ready to see how you did, check out the video explanation from our GMAT teacher, Jess.

If f(x) = ax² + bx + c, and a does not equal 0, at what point does the graph of the function f(x) intersect the y-axis?

  1. The graph of f(x) intersects the x-axis exactly twice, at (-6, 0) and (-2, 0)
  2. a = 2

(A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
(B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
(C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
(D) EACH statement ALONE is sufficient.
(E) Statements (1) and (2) TOGETHER are NOT sufficient.

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