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Multiple Choice
Write the standard form equation of the circle described. Give the center and radius.
A
; Center: ; Radius:
B
(x−4)2+(y−6)2=72; Center: ; Radius: 7
C
; Center: (6,4); Radius: 7
D
(x−4)2+(y−6)2=72; Center: (4,6); Radius:
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Verified step by step guidance
1
Start with the given equation of the circle: \(x^2 + y^2 - 8x - 12y + 3 = 0\).
Group the \(x\) terms and \(y\) terms together: \((x^2 - 8x) + (y^2 - 12y) = -3\) (move the constant to the right side).
Complete the square for the \(x\) terms: take half of \(-8\), which is \(-4\), then square it to get \$16\(. Add \)16\( inside the parentheses for \)x$ terms.
Complete the square for the \(y\) terms: take half of \(-12\), which is \(-6\), then square it to get \$36\(. Add \)36\( inside the parentheses for \)y$ terms.
Since you added \$16\( and \)36\( to the left side, add \)16 + 36 = 52\( to the right side as well to keep the equation balanced. Then rewrite the equation as \)(x - 4)^2 + (y - 6)^2 = 3 + 52$.