Nonlinear Functions

SAT Math· difficulty 3/5

Find the vertex of y=x210x+21y = x^2 - 10x + 21.

  • A

    (5,4)(5, 4)

  • B

    (5,4)(-5, -4)

  • C

    (5,4)(5, -4)

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  • D

    (10,21)(10, 21)

Explanation

x=10/2=5x = 10/2 = 5, y(5)=2550+21=4y(5) = 25 - 50 + 21 = -4.

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