Linear Functions

SAT Math· difficulty 3/5

If f(x)=3x4f(x) = 3x - 4, what is f(2)+f(1)f(2) + f(-1)?

  • A

    3-3

  • B

    0

  • C

    5-5

    check_circle
  • D

    5

Explanation

f(2)=64=2f(2) = 6 - 4 = 2 and f(1)=34=7f(-1) = -3 - 4 = -7. Sum =2+(7)=5= 2 + (-7) = -5.

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