precalculus

basic rules of functions

basic rules of functions


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LINEAR FUNCTION

f(x)=mx+b

g(x)=f(x+m)

SHIFT LEFT by m

g(x)=f(x-m)

SHIFT RIGHT by m

g(x)=f(x)+m

SHIFT UP by m

g(x)=f(x)-n

SHIFT DOWN by m

g(x)=m*f(x)

STRETCH VERTICALLY by m

g(x)=f(m*x)

COMPRESS HORIZONTALLY by 1/m

g(x)=f(m*x), m<1

STRETCH HORIZONTALLY 

g(x)=f(x)*m, m<1

COMPRESS VERTICALLY 

g(x)= -(f(x))

REFLECTION ACROSS X AXIS

up becomes down and vice versa

g(x)=f(-x)

REFLECTION ACROSS Y AXIS

left becomes right and vice versa

f(x)=mx+b

LINEAR FUNCTION

Linear Function

f(x)=mx+b

N

THE SET OF ALL NATURAL NUMBERS

{1,2,3,4,...}

.

THE SET OF WHOLE NUMBERS

{0,1,2,3,4,...}

Z

THE SET OF INTERGERS

{...,-2,-1,0,1,2,...}

Q

THE SET OF RATIONAL NUMBERS 

{p/q: p and q are integers, q does not equal 0}

I

THE SET OF IRRATIONAL NUMBERS 

{x: x cannot be expressed as a ratio of 2 integers}

R=?U?

R=QUI

THE SET OF ALL REAL NUMBERS

.

empty set {}

Q intersection I=?

empty set {}

.

A BELONGS TO SET B

 

.

A IS NOT IN SET B

.

INCLUSION

A IS A SUBSET OF B

all elements of A are in B

.

INTERSECTION 

THE SET OF ELEMENTS IN BOTH A AND B

{x: x€A and x€B}

the overlap of elements from A and B

AUB

UNION

THE SET OF ALL ELEMENTS FROM BOTH A AND B

{x: x€A OR x€B}

what is this called?

THE DOMAIN

what is this called?

THE RANGE

what toolkit function is this?

CUBE ROOT

f(x)=cube root of x

what toolkit function is this?

SQUARE ROOT

f(x)=square root of x

x >= 0

what toolkit function is this?

RECIPROCAL SQUARED

f(x)=1/(x squared)

what toolkit function is this?

RECIPROCAL

f(x)=1/x

what toolkit function is this?

CUBIC

f(x)=x cubed

what toolkit function is this?

QUADRATIC

f(x)=x squared

what toolkit function is this?

ABSOLUTE VALUE

f(x)=|x|

what toolkit function is this?

IDENTITY

f(x)=x

what toolkit function is this?

CONSTANT

f(x)=c

c is constant

?

YES

PASSES THE VERTICAL LINE TEST

?

NO

FAILS THE VERTICAL LINE TEST

what's this called?

4th QUADRANT