Functions as Equations Review

If a question asks you to find f(2), what does that mean?

• Let x = 2

• Let y = 2

Given f(x) = -4x - 10 and f(x) = 10. Find x

• x = -5
• x = 5
• x = -50
• x = 30

Evaluate f(-2) if f(x) = x + 3

• -1
• 1
• 5
• -5

Is this mapping a function or not a function? 

• Function
• Not a Function

Is this graph a function or not a function? 

• Function
• Not a Function

If f(x) = 3(6 - x), find f(-4).

f(x) = x² + x - 3

g(x) = 3x

Find f(g(x))

• 9a² - 3a + 3

• 9a² + 3a - 3

• 3a² - 3a + 3

• 3a² + 3a - 3

f(x) = x²+9
g(x) = x-9
Find f(x)-g(x). 

• x²+x+9
• x²-x+9
• x²-x
• x²-x+18

What is f(5)?

• -2

• 0

• 15

• 150

f(x) is the same thing as ______.

• y
• x
• input
• an equation