Abstract
(4) R 1=r1-A/3, R2 = r2-A/3 and R3 =r3A/3. Thus, our task is to first find the real roots of equation (2) by using the slide rule, and then use equations (4) to find the roots of equation (I). We shall solve equation (2) by considering the following cases. CASE 1. When q is a positive number, c, and p is a negative number, -d, in the special cubic equation (2). For this case, we may write equation (2) as
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