Question 310645
Complete the square in x and y.
{{{ 16x^2+25y^2-64x+50y-311=0}}}
{{{ 16x^2-64x+25y^2+50y-311=0}}}
{{{ 16(x^2-4x)+25(y^2+2y)-311=0}}}
{{{ 16(x^2-4x+4)+25(y^2+2y+1)-311=64+25}}}
{{{ 16(x-2)^2+25(y+1)^2=64+25+311}}}
{{{ 16(x-2)^2+25(y+1)^2=400}}}
{{{ (x-2)^2/25+25(y+1)^2/16=1}}}
Center : ({{{2}}},{{{-1}}})
a: {{{5}}}
b:{{{4}}}
c:{{{sqrt(5^2-4^2)=3}}}
{{{ graph( 300, 300, -8, 8, -8, 8, -1+sqrt((400-16(x-2)^2)/25),-1-sqrt((400-16(x-2)^2)/25))}}}