Today we did more on functions

What Is a Function you ask?

A function is a special type of relation where each x-value in the domain corresponds to ONLY 1 y-value in the range.

example: Graph f(x)= x-1 means the same as y=x-1

D:{xER}

R:{xER}

y-intercept --> f(0)=x-1

=0-1

=-1

the zeros of the function are the x-intercept(let y=0)

f(x)=x-1

0=x-1

1=x

to find zero let F(x)= 0

Graph, find D and R and the zeros for f(x)=3/2x-3

D:{xER}

R:{xER}

zeros: f(x)=3/2x-3

0=3/2x-3

2(3)=(3/2)2x

6=3x

2=x

f(x)=1/2x-3

0=1/2x-3

2(3)=(1/2)2x

6=x

linear functions f(x)=mx+b

constant functions f(x)=b <-- has no x value

will always be a straight line.

f(x)=-4

HOMEWORK: ex. 54 # 1-9, 12

55 # 1-7