2 3.2 The graph of f(x) = -x = -x + 8x + 20 is sketched below. The graph intersect the x - axis at (-2;0) and (10;0), and - axis at (0;20). The point (4;36) is the turning point of f. the y 3.2.1) Determine the value of k if g(x) = 4x + k is the tangent of 2 f(x) = -x + 8x + 20​