Find the 3rd derivative of the following f(x) = 7x 3x3-9x² 2x 8 2: Derive the formula of relationship between the roots and coefficients of a quadratic equation. Q3: Find maxima of the function y = -x2 And also draw the graph 4. Find the values of m and n so that the given function f is continuous at x=3 at mx if x<3 at n if x=3 -2x 9 if x>3