$400 at 6.4 for 2 years

Find the missing factor in exponential form 48^2=3^2 • ?

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)

Write the equation in general quadratic form: plz !