3. (30 marks) The following function is about the force generated by a rocket engine for certain amount of a propellant additive: 1 f(m)=2m2+;+3 Where 0.5 S x S 2 is the amount of additive and f (m) is the force generated. (a) Find the amount of additive such that the force is the greatest value. (10 marks) (b) Find the amount of additive such that the force is the least value. (10 marks) (c) Find the range of :c such that the function is concave upward. (7 marks) ((1) Is there any inection point