3. Find the derivative function f' for the function f. b. Find an equation of the line tangent to the graph off at (a,f(a)) for the given value of a. f(x)=2x27x+5,a=1 02 f(a + h) -f(a) a. Use the definition mean = lim h to find the slope of the line tangent to the graph of f at P. h - 0 b. Determine an equation of the tangent line at P. f ( x) = x2 + 4, P(-5,29) a. mtan b. y =