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9 : . d h The gradient of a curve is given by =e" 4e", (@ (b) (c) Show that the x-coordinate of any point on the curve at which the gradient is 3 satisfies the equation (*) 3e* 4 = 0. 2] Hence show that there is only one point on the curve at which the gradient is 3, stating the exact value of its x-coordinate. [3] The curve passes through the point (0, 0). Show that when x = 1 the curve is below the x-axis. [5]