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Write the Given Equation in the Form (xh)2+(yk)2=r2( x - h ) ^ { 2 } + ( y - k ) ^ { 2 } = r ^ { 2 }

question 272

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Write the given equation in the form (xh) 2+(yk) 2=r2( x - h ) ^ { 2 } + ( y - k ) ^ { 2 } = r ^ { 2 } . Identify the center and radius.
- x2+y2+22x+21=0x ^ { 2 } + y ^ { 2 } + 22 x + 21 = 0


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