A curve has equation y = f(x). (a) Write an expression for the slope of the secant line through the points P(2, f(2)) and Q(x, f(x)). Of( x) -x f(2) - 2 Of(2) - 2 f ( x ) - x Of(x) - f(2) X - 2 O X - 2 f ( x ) - f( 2 ) (b) Write an expression for the slope of the tangent line at P. O lim ( x) - x x - 0 f(2) - 2 O lim m f(x) - f( 2 ) X - 0 X -2 O lim f( x ) - f(2 ) x -2 X - 2 O lim X - 2 x - 2 f (x ) - f(2 )