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Question

Find the equation of the circle which is concentric with the circle 2x2+2y2+3x4y+5=0 and whose radius is 25 units.

A
4x2+4y2+6x8y55=0
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B
4x2+4y2+6x8y+90=0
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C
4x2+4y2+6x8y+57=0
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D
4x2+4y2+6x8y+87=0
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Solution

The correct option is A 4x2+4y2+6x8y55=0

Center of given circle = (32×2,42×2)=(34,1)

Given r=25

Equation of circle with Center C(a,b) and radius r is

Equation of circle is (xa)2+(yb)2=r2

Equation is (x+34)2+(y1)2=4×5

4x2+4y2+6x8y55=0


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