Chapter 1 Lesson B: Functions

Function machines: illustrate how functions behave

F(x) is the value of y for a given value of x so y = F(x)

• y = f(x) ----> 2x^2 - 3x find f(5)
• 2(5)^2 - 3(5) = 50 - 15.  f(5)= 35
• f(x) = 5- x-x^2
• a. f(-x) = 5-(-x) - (-x)^2 = 5+x-x^2
• b. f(x+2)- (x+2)^2 --->  5-x-2-x^2 - 4x-4
• f(x+2)= -x^2 -5x-1