In terms of pi, what is the area of the circle defined by the equation 2x^2+2y^2+20x-16y-18=0
+36916 2x^2+2y^2+20x-16y-18=0 divide by 2
x^2 + 10x + y^2 - 8y = 9 complete the square for x and y
(x+5)^2 + ( y -4)^2 = 9 + 25 +16
= 50 this is a circle centered at -5,4 and r^2 = 50 <===== use this to calculate the area of the circle
