document.write( "Question 262828: Find the equation of a circle: center(-2,0):passes through(2,0) \n" ); document.write( "

Algebra.Com's Answer #193596 by drk(1908) $\"\"$ $\"About$

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The equation of a circle can be expressed as
\n" ); document.write( " $\"%28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2\"$
\n" ); document.write( "we know the center, so we have
\n" ); document.write( " $\"%28x%2B2%29%5E2+%2B+%28y%29%5E2+=+r%5E2\"$
\n" ); document.write( "the distance from the center to the point on the circle is 4. This is also called radius. SO, we get
\n" ); document.write( " $\"%28x%2B2%29%5E2+%2B+%28y%29%5E2+=+4%5E2\"$ \n" ); document.write( "

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