If an airplane is moving at velocityv , the dragD (in N ) on the plane isD=av²+(b/v²) , where a= 5.20(10)^-3 and b= 3.05 (10)⁸ . Find the value(s) ofv (in km/h), for which the drag is the least. Round the answer to one decimal place.

NOTE: need to see those step how did you preform this equation from the begging to the final answer thank you