Could you please show your work so I can understand how you got the answer. Also I need this by 3. Thank you!

3. Calculate the differential of f(x) =x] + 0.7x^3 at x = 1

4. Calculate the differential of f(x) =x] + 0.7x^3 at x = 4

-For both problems calculate the error in the output if the input has a error of at most 0.25

-For both problems calculate the precision in the input required to ensure that the output has an error of less than 0.5