Given an input
f(x) = 2x + 3
f(2)
7
f(x) = 3x − 2
Solve f(x)=4
x = 2
f(x) = 2x-1
f(30)
59
f(x) = 2x²
f(3)
18
f of x is 2.
f(x)=2
g(x) = x² − 4x
g(5)
5
f(x) = 5x − 4
f(x) = 6
x=2
f(x) = x − 18
f(14)
-4
f(x) = 4x + 8
f(-4)
-8
If you come to school later than 8:00 AM, what happens to each class that you didn't attend?
It's a class cut.
h(x) = 3x − 1
h(2x + 1)
6x + 2
f(x) = 2x + 7
f(x)=9
f(x) = 7x - 5
f(2)
9
f(x) = x³ +3x
f(2)
14
f(3) means to do what in words?
Input an x of 3 everywhere there is an x and simplify.
(x² − 1)/(x − 1)
f(4)
5
f(x) = x - 3
f(x)= 4
x = 7
f(x) = 9x − 6
f(1)
3
f(x) = x³
f(3)
27
If f(2) = 3, what is the output? How do you know?
3 is the output because it's on the outside of the parentheses.
f(x) = 2x + 1
f(-10) =
-19
g(x)=-2x+5
g(x) = 11
x = -3
f(x) = 20x-10
f(x) = 50
x=3
f(x) = x⁵ − x³ + 2x² + 10x + 20
f(2)
44
NOTE: Squared means multiplied by itself
If f(x) = x², then f(−2)=
f(-2)=(-2)(-2) = 4