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Barrelracing
 one year ago
What is the equation of the quadratic graph with a focus of (4, −3) and a directrix of y = −6?
a) 1/6x^2 +4/3x + 11/6
b) 1/6x^2  4/3x  11/6
c) 3/50x^2 + 11/25x + 3/5
d) 2/50x^2 + 11/25 + 2/5
Barrelracing
 one year ago
What is the equation of the quadratic graph with a focus of (4, −3) and a directrix of y = −6? a) 1/6x^2 +4/3x + 11/6 b) 1/6x^2  4/3x  11/6 c) 3/50x^2 + 11/25x + 3/5 d) 2/50x^2 + 11/25 + 2/5

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freckles
 one year ago
Best ResponseYou've already chosen the best response.1dw:1444325601632:dw the vertex is halfway between the directrix and the focus

freckles
 one year ago
Best ResponseYou've already chosen the best response.1what number is midway between 3 and 6?

freckles
 one year ago
Best ResponseYou've already chosen the best response.1but what number is midway between 3 and 6? hence do you know how to find the average of 3 and 6?

freckles
 one year ago
Best ResponseYou've already chosen the best response.1the average of two numbers is the sum of the numbers divided by 2

freckles
 one year ago
Best ResponseYou've already chosen the best response.13+(6)=9 9/2 equals 4.5 not 1.5

Barrelracing
 one year ago
Best ResponseYou've already chosen the best response.0oh i did wrong sorry

freckles
 one year ago
Best ResponseYou've already chosen the best response.14.5 makes since because this number is halfway between 4 and 5

freckles
 one year ago
Best ResponseYou've already chosen the best response.1it is also the number halfway between 3 and 6

freckles
 one year ago
Best ResponseYou've already chosen the best response.1dw:1444325972949:dw

freckles
 one year ago
Best ResponseYou've already chosen the best response.1so our parabola looks like this roughly : dw:1444326013448:dw

freckles
 one year ago
Best ResponseYou've already chosen the best response.1anyways the equation is \[4p(yk)=(xh)^2 \\ \text{ where } (h,k) \text{ is the vertex } \\ \text{ and } p \text{ is the distance between the vertex and the focus } \\ \text{ we also have } p>0 \text{ here since the vertex is above the directrix } \\ \text{ if it was the other way around we would have } p<0\]

Barrelracing
 one year ago
Best ResponseYou've already chosen the best response.0ok thank you i get it now
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