#2**+10 **

Best Answer

$$\\T=x^2+y^2-4x+2y\\\\

T+4+1=(x^2-4x+4)+(y^2+2y+1)\\\\

T+5=(x-2)^2+(y+1)^2\\\\

T=(x-2)^2+(y+1)^2\;-5\\\\$$

Now anything squared has to be greater or equal to zero so T has to be greater to or equal to -5 degrees.

This will occur when x=2 and y=-1

Melody Nov 3, 2014