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The graph of $(x-3)^2 + (y-5)^2=16$ is reflected over the line $y=2$. The new graph is the graph of the equation $x^2 + Bx + y^2 + Dy + F = 0$ for some constants $B$, $D$, and $F$. Find $B+D+F$.

 

I'm confused... The answer is NOT 2.

 Jun 16, 2018
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the first equation is a circle with center at (3,5) and radius 4

 

it is reflected over y=2 

 

drawing a picture a got

 

the new center is at (3,-1) radius still 4

 

that means the equation is (x-3)^2 + (y+1)^2 = 16

 

expand that to x^2-6x+9 + Y^2 +2Y +1 = 16

 

combine like terms to get 

 

x^2-6x + Y^2 +2Y -6 so b= -6 d= 2 f= -6

 

b+d+f = - 10

 Jun 16, 2018

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