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What is the equation of the function below?

 

 

 May 20, 2016
 #1
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+5

Well....it could be lots of things.....but....let's try this one.........

 

Let's assume that this is the bottom half of a sideways parabola opening to the right

 

Let's call the vertex  (h,k)  =  (5 ,6)     and we know that point  (9, -2)  is on the graph.......so........we have this form :

 

(x - 5) = a(y - 6)^2      now......substitute 9 for x and -2 for y   and solve for a......and we have

 

(9 -5)  = a(-2 - 6)^2

 

4  = a(64)   divide both sides by 64

 

a = 4/64   = 1/16

 

So........our full equation is

 

(x - 5)  = (1/16)(y - 6)^2     but we only want the bottom part of the graph....so....    

 

Multiply both sides by 16

 

16(x - 5)  = (y - 6)^2         take the pos/neg square roots of both sides

 

± 4 √ (x - 5)  = y  - 6

 

Since we want the bottom part, we will take the negative root

 

- 4 √ (x - 5)  = y  - 6     add 6 to both sides

 

-4 √ (x - 5) + 6  = y    and we can write this as :

 

y = -4 √ (x - 5) + 6 

 

Here's the graph : https://www.desmos.com/calculator/tpovquifna

 

 

 

cool cool cool

 May 20, 2016

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