document.write( "Question 961980: Convert equation to standard form for a circle if needed then solve center and radius for four problem
\n" ); document.write( "1) x^2+y^2+6y=-50-14x
\n" ); document.write( "2) x^2+y^2+2x-15=0
\n" ); document.write( "3) x^2+y^2-3x+8y=20
\n" ); document.write( "4) x^2+y^2+2x+4y=20
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #587717 by lwsshak3(11628)\"\" \"About 
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Convert equation to standard form for a circle if needed then solve center and radius for four problem
\n" ); document.write( "standard form of equation for a circle: (x-h)^2+(y-k)^2=r^2, (h,k)=coordinates of center, r=radius
\n" ); document.write( "1) x^2+y^2+6y=-50-14x
\n" ); document.write( "x^2+14x+y^2+6y=-50
\n" ); document.write( "complete the square:
\n" ); document.write( "(x^2+14x+49)+(y^2+6y+9)=-50+49+9
\n" ); document.write( "(x+7)^2+(y+3)^2=8
\n" ); document.write( "center: (-7,-3), radius=√8
\n" ); document.write( "..
\n" ); document.write( "2) x^2+y^2+2x-15=0
\n" ); document.write( "complete the square
\n" ); document.write( "(x^2+2x+1)+y^2=15+1
\n" ); document.write( "(x+1)^2+y^2=16
\n" ); document.write( "center:(-1,0), radius=4
\n" ); document.write( "..
\n" ); document.write( "let you do the rest
\n" ); document.write( "3) x^2+y^2-3x+8y=20
\n" ); document.write( "4) x^2+y^2+2x+4y=20 \n" ); document.write( "
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