JL is represented by the expression (10x^2 - 46x + 48)/M^2. To find JL, first you must find J and L. Do this by dividing JM and LM by M, then multiplying the two together. This gives JL = (5x - 8)(2x - 6)/M^2. Multiplying out the brackets gives (10x^2 - 30x - 16x + 48)/M^2 which gives (10x^2 - 46x + 48)/M^2.
