List of top Mathematics Questions on coordinates of a point in space asked in AMUEEE

If P is a point $ (x,y) $ and $ P_1 = (3,0),P_2 = (-3,0) $ and $ 16 x^2 + 25y^2 = 400 $ , then $ PP_1 + PP_2 $ is equal to
The image of the point $(1, 2, 3)$ in the plane $x + y + z + 3 = 0 $ is