4
advanced-math

Which feature is NOT visible directly from the standard form y=ax2+bx+cy = ax^2 + bx + c?

A

The vertex coordinates

B

The y-intercept

C

The direction of opening

D

The vertical stretch factor

Correct Answer: A

Choice A is the correct answer.

  • A: The vertex requires calculation (h=−b/2ah=-b/2a) and is not immediately visible.
  • B: The y-intercept is simply cc. (Visible)
  • C: The direction is determined by the sign of aa. (Visible)
  • D: The stretch is determined by the magnitude of aa. (Visible)

Choice B is incorrect because cc is the y-intercept. Choice C is incorrect because aa determines direction. Choice D is incorrect because aa determines stretch.

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Set 9: Quadratic Equations and Functions 9