Project Summary: Given that y = 9x - 8x 3, find dy/dx from first principle 4 marks Differentiate 3/(x) - 4(x) with respect to x. 3 marks A rectangular sheet of metal having dimensions 20 cm by 12 cm has squares removed from each of the four corners and the sides bent upwards to form an open box. Determine the maximum possible volume of the box. er.