Thursday 7 June 2012

Math Assignment!

Here's a link to my independent math assignment! :)

http://www.glogster.com/tay-math/video-glog-by-tay-math-independent-math-assignment/g-6lgcls32o6sgts052t023a0


I used the Glogster tool and it was really cool! 

I decided to make a video glog so that i could play around with iMovie at the same time. 

Check it out ! 

Thursday 9 February 2012

Square Root Function

* Not finished

Square Root Function

Basic Properties:
 : Means the positive square root of X, which is only possible if X > 0

 : Means the negative square root of X, which is only possible if X > 0

: Means the positive square root of -X, which is only possible if X< 0

: Means the negative square root of -X, which is only possible if X < 0


On the graph : 




Transformed function:

Role of h and k is to shift the function according to their values. (h,k) is the point where the function begins.

Examples:

                                                                                                                           




                                



Simplifying out parameter b:

Factor out parameter b and factor out of parameter h.  
Sometimes, b can only simplified to -1.

Examples:
      G(x) =                 H(x) = 

    G(x) =                 H(x) = 





Tuesday 7 February 2012

Absolute Value Function

I've been condensing my notes into a couple pages per topi. I plan to do this kind of post for all of the functions, so I hope you like it and hope it helps with anyone trying to review the basics :)


Absolute Value Function 
Y= a |bx-h| + k


Basic absolute values:
|4| =  4         |1-5| = 4            |n • m| = |n| • |m|
|-3| = 3         |-6 x 2| = 12     |n/m| = |n| / |m|


If |?| = a and a > 0, there are 2 possible answers : -a and a
Example: |a| = 66, a can equal 66 or - 66


|?| = -1  IS IMPOSSIBLE
Simplifying parameter b :
To simplify parameter b, simply make it into parameter a by multiplying the absolute value of b with the value of a. If  parameter h is involved, factor out parameter b. 

Examples:  


f'(x) = 2|-3x|        g(x)= 4 |2x-2| +3            h(x)= |2x|
f(x)= 6 |x|            g(x)= 4 |2 (x-1)| + 3       h(x)= 2 |x|
                              g(x) = 8 |x-1| + 3
  
TO FIND THE VERTEX WE MUST FIRST SIMPLIFY PARAMETER B


Properties of f(x)= a |x-h|+ k


If a > 0
Domain = R
Range = [k, ∞
Vertex (h,k)
Min: k
Slopes of sides: +a, -a 






If a< o

Domain = R
Range = -∞, k]
Vertex (h,k)
Max: k
Slopes of sides: +a, -a 




Finding the rule:

1. Write template : y= a |x-h|+ k
2. Fill in given parameters
3. Substitute given point
4. Solve for missing parameters

Example 1: Given point (9, 17) and vertex (3,5)
1. y= a |x-h|+ k
2. y= a |x-3|+ 5
3. 17= a |9-3|+ 5
4. 17= 6a +5
      a=2
f(x)= 2 |x-3|+ 5

Example 2: Given zeroes -5 and 3, and minimum value of -2
* Because the vertex h is between the 2 zeroes, add and divide by 2 : (-5+3)/ 2 = -1
    vertex (-1, -2)
1. y= a |x-h|+ k
2. y= a |x+1|- 2
3. 17= a |3+1|- 2 
4. 2= 4a
      a= 0.5
f(x)= 0.5 |x+1|- 2


Finding the zero(es)
In an absolute value function, there can be 0, 1 or 2 zeroes. 
* change result of absolute value so you have both a negative and positive answer before you solve for x 
Example:  f(x)= |x+2| - 6
0= |x+2| -6
6=x+2
AND
-6= x+2
x= 4 or x= -8

Solving inequalities
In an absolute value function, there are 4 different possibilities for the answer of an inequality, they are:
a) 1 interval   X E [ 1st zero, 2nd zero]
b) 2 intervals   X E -∞, 1st zero] U [ 2nd zero, ∞
c) The entire X axis
d) The empty set X E ∅ 


Example: Rule < 0


a)

b)


c)

d)