
William W. answered 10/18/21
Math and science made easy - learn from a retired engineer
36x2 - 81y2 + 24x + 328 = 0
36x2 - 81y2 + 24x = -328
36x2 + 24x - 81y2 = -328
36(x2 + 24/36x ) - 81y2 = -328
36(x2 + 2/3x ) - 81y2 = -328
36(x2 + 2/3x + 1/9) - 81y2 = -328 + 36(1/9)
36(x + 1/3)2 - 81y2 = -328 + 4
36(x + 1/3)2 - 81y2 = -324
36/-324(x + 1/3)2 - 81/-324y2 = -324/-324
-1/9(x + 1/3)2 + 1/4y2 = 1