Consider the function f(x)=3x-20x +42x-36x Find the critical numbers of f .Hint: f'(x)=12(x-3)(x-1) Give the interval(s) of increase and decrease of f. Give the value(s)

Consider the function f(x)=3x-20x² +42x²-36x 

Find the critical numbers of f .Hint: f'(x)=12(x-3)(x-1)² 

Give the interval(s) of increase and decrease of f. 

Give the value(s) of x at which f has either a local minimum or a local maximum. 

Give the interval(s) where the graph of f is concave up. 

Give the values of x where the graph of f has inflection.