Question 753015
A circle is tangent to the x axis and has its center at (8,-5). Give the equation of the circle in polynomial form. 
Standard form of equation for a circle: (x-h)^2+(y-k)^2=r^2, (h,k)=(x,y) coordinates of center, r=radius.
For given circle:
center: (8,-5)
radius=5
equation: (x-8)^2+(y+5)^2=25
equation in polynomial form:
x^2-16x+64+y^2+10y+25=25
x^2+y^2-16x+10y=0