Functions and Function Notation Review

For the function {(0,1), (1,-3), (2,-4), (-4,1)}, write the domain and range.

• D: {1, -3, -4,}
  R: {0, 1, 2, -4}

• D:{-4, 0, 1, 2}
  R:{-4, -3, 1}

• D:{0, 1, 2, 3, 4}
  R:{1, -3, -4}

What is a function?

• For every input, there is exactly one output.

• For every output, there is exactly one input.

• When there is a polynomial expression

• When the degree of the polynomial is even.

What is the domain of the following graph?

• (-∞,∞)

• (-∞,4]

• (-∞,3]

• [-2.5,4]

What is the domain?

• The set of all input values

• The set of all output values

What is the range?

• -4 < x ≤ 5

• -4 ≤ x < 5

• -3 < y < 3

• -3 ≤ y ≤ 3

What is the DOMAIN of this graph?

• -7≤x<5

• -7≤y<5

• -3<x<1

• -3≤y<1

What is x if
f(x) = -2?

• 4

• 0

• 3

• 8

If f(x) = 2x + 1, what would be your first step to find f(1)?

• Plug a 1 in for all the x's

• Set the function equal to 1

• Only plug a 1 into the left side

• Only plug a 1 into the right side

• I don't know

Given that g(x) = 3x + 1, find g(2).

• 6

• 7

• 8

• 9

• 0

Evaluate for f(1)

• 0

• -3

• 3

• 2

• 4