Function Notation
find f(-9) - g(8) when f(x) = -2x -5 and g(x) = (1/2)x -3 Are -9 and 8 both inputs or outputs?
. Think: This is the input and x represents the input so replace x with -9 for f(x) and 8 for g(x). Simplify to find the output value 12
Find f(-2).
Look at the graph. You should get an output of -3
Find f(3)
Look at the graph. You should get an output of -4
Find f(1)
Look at the graph. You should get an output of 3
Find f(2).
Look at the graph. You should get an output of 3
Find f(5)
Look at the graph. You should get an output of 3
Find f(-2).
Look at the graph. You should get an output of 3.
Find f(2).
Look at the graph. You should get an output of 3.
Find f(-3).
Look at the graph. You should get an output of 4
Find f(1)
Look at the graph. You should get an output of 50
Find f(0).
Look at the graph. You should get an output of 6
given f(x) = 5x + 10, find f(x - 3) Is (x - 3) the input or the output?
Think: This is the input and x represents the input so replace x with (x - 3) Simplify to find the output value setup: f(x - 3) = 5(x - 3) + 10 The result is 5x - 5
Find f(-2) = -10x + 4 Is -2 the input or the output?
Think: This is the input and x represents the input so replace x with -2. Simplify to find the output value. 24
Find f(x) = 5x - 6 when f(-4) Is -4 the input or the output?
Think: This is the input and x represents the input so replace x with -4. Simplify to find the output value f(-4) = -26
Find f(x)= -x+10 when f(-7) Is -7 the input or the output?
Think: This is the input and x represents the input so replace x with -7 Simplify to find the output value setup: f(-7) = -(-7) + 10 f(-7) = 17
Find f(12) = 10x+6 Is 12 the input or the output?
Think: This is the input and x represents the input so replace x with 12. Simplify to find the output value setup: f(12) = 10(12) + 6 f(12) = 126
Find f(x)= -7x +1 when f(3) Is 3 the input or the output?
Think: This is the input and x represents the input so replace x with 3. Simplify to the output value. setup: f(3) = -7(3) + 1 f(3) = -20
Given f(x) = 3x - 7 find f(t) Is the t the input or the output?
Think: This is the input and x represents the input so replace x with t. Simplify to find the output value setup: f(t) = 3t - 7 The output is 3t - 7
find x for f(x) = 4x + 2 when f(x) = -2 Is -2 the input or the output?
Think: This is the output and f(x) represents the output so replace f(x) with -2. Solve for x. -1
find x for f(x) = -4x - 8 when f(x) = -48 Is -48 the input or the output?
Think: This is the output and f(x) represents the output so replace f(x) with -48. Solve for x. 10
Find x for f(x) = -6x -5 when f(x) = 25 Is 25 the input or the output?
Think: This is the output and f(x) represents the output so replace f(x) with 25. Solve for x. Setup: 25 = -6x - 5 f(-5) = 25
Find x for f(x) = -6x + 7 when f(x) = 61 Is 61 the input or the output?
Think: This is the output and f(x) represents the output so replace f(x) with 61. Solve for x. setup: 61 = -6x + 7 -9
The x in the function f(x) represents the
input value, x-value; what you put in to get out.
The f(x) in the function f(x) represents the
output value, y-value, what you get out when from the function.
