Heyyy, please help me with my calculus grade 12 homework. Please ensure that it's all handwritten and done on paper and consists of all steps. (Im a slow learner lol). Thanks!

Knowledge and Understanding (10 marks) 1. Find the interval(s) over which the function f(x) =3x" +16x" +24x* 16 is concave up and concave down. (4 marks) 2. Determine the critical points of the given function and classify the nature of each critical point. (i.e. is the critical point a local min / local max / or inflection point) 2 fay=2""7 x+4 (6 marks)