Writing an equation in general form (circles)

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To convert the equation (x+9)²+(y-5)²=12 into general form, expand it to get x² + 18x + 81 + y² - 10y + 25 = 12. Next, combine like terms to simplify the equation to x² + y² + 18x - 10y + 94 = 0. The coefficients A and B are both 1, while C is 18, D is -10, and E is 94. To find E, subtract 12 from both sides of the original equation. The final general form is x² + y² + 18x - 10y + 94 = 0.
kamo00800
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(keep in mind, its circle math.. :/)
Write the equation (x+9)2+(y-5)2=12 in general form.
 
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If my memory is correct, general form is just Ax2 + By2 + Cx + Dy + E = 0. In this case, A and B are 1. Just expand what you have to write your equation in general form.
 
okay, but
Ax2 + By2 + Cx + Dy + E = 0
where do i get E...
cause 12 is on the other side of the =
 
kamo00800 said:
okay, but
Ax2 + By2 + Cx + Dy + E = 0
where do i get E...
cause 12 is on the other side of the =
Then subtract 12 from both sides of the equation.
 

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