The stock pn'ce for a companyr for the years 2010 through 2016 can be approximated by x) = lllIBx3 20.4)(2 + 301x1291(105x518).where x = 10 corresponds to the year 2010. [a] Find f'{x]. [b] Use the quadratic formula to nd the critical numbers of for). [c] Find f"(x)_ [[1] Use the secondderivative test to determine in what years the price was at a local maximum or minimum. [a] f'(x]= 1.3sx24u_3x+301 [b] The critical number{5) of x] isiare . (Round to two decimal places as needed. Use a comma to separate answers as needed.)