. For the function f, f'(x) = 3x - 9 and (2) = 5. Find the approximation for f (2.2) by using the line tangent to the graph of at x = 2. What formula would be used to calculate a local linear approximation for f(x)=e3 around x = 1? For the function f, f'(x) = 4x-3 and (2) = -4. Find the approximation for f (1.8) by using the line tangent to the graph of at x = 2.