Answer:
The answer to your question is
Standard form

General form
400x² + 144y² - 4800x - 864y - 41904 = 0
Explanation:
Data
Vertical ellipse
Mayor axis = a = 20
Minor axis = b = 12
Center = (6, 3)
Formula

Substitution and standard form

General equation
400(x - 6)² + 144(y - 3)² = 57600
400(x² - 12x + 36) + 144(y² - 6y + 9)² = 57600
400x² - 4800x + 14400 + 144y² - 864y + 1296 = 57600
400x² + 144y² - 4800x - 864y +14400 + 1296 - 57600 = 0
400x² + 144y² - 4800x - 864y - 41904 = 0