Help I’m so confused

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents