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Nonlinear Functions

SAT Math· difficulty 4/5

The minimum of y=3x2+12x+ky = 3x^2 + 12x + k is 1. What is kk?

  • A

    11

  • B

    1313

    check_circle
  • C

    1111

  • D

    −11-11

Explanation

Vertex x=−12/6=−2x = -12/6 = -2. y(−2)=12−24+k=k−12=1y(-2) = 12 - 24 + k = k - 12 = 1, so k=13k = 13.

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