Maxima minima


@pratimejaiswal
the given curve is hyperbola.
for hyperbola $x_{2}/a_{2}−y_{2}/b_{2}=1$
any line y=mx+c is tangent if $c_{2}=a_{2}m_{2}−b_{2}$ ......(1)
. so now perpendicular to 5x+2y10=0 means slope of tangent is 2/5
use in 1