Consider the function and the value of a. f ( x ) = . 7 a = 4 x2 (a) Use mean = lim f(a + h) - f(a) to find the slope of the tangent line mtan = f'(a). h - 0 h mtan (b) Find the equation of the tangent line to fat x = a. (Let x be the independent variable and y be the dependent va X