Negative number
It is evident that a single Quantity can never be marked with either of these Signs, or considered as either Affirmative or Negative; for, if any single Quantity, as b is marked either with the Sign + or the Sign -, without assigning any other Quantity to which it is to be added, or from which it is to be subtracted, the Mark will have no Meaning or Signification. Thus, if it be said, the Square of -5, or the Product of -5 into -5, is equal to +25. Such an Assertion must either signify no more than 5 times 5 is equal to 25, without any Regard to the Signs, or it must be meer Nonsense, and unintelligible Jargon. — Negative number time Now, what I here propose is, first to apply the Operations of Arithmetic to Compound Quantities, consisting partly of Affirmative, and partly of Negative Quantities, or to the Differences of Simple Quantities, and to demonstrate the Rules usually given for Multiplication, to wit, that - X + gives -, + X - gives -, + X + gives +, and - X - gives +, or that as often as the Signs of the Multiplier and Multiplicand are alike, the Product is to be marked +, and as often as they are unlike, the Product is to be marked -; and secondly, to shew how the roots of Quadratic and Cubic Equations may be assigned by the common Rules given for that Purpose, without having Recourse to any other Idea of a Negative Quantity, than the very Simple One above defined. — Negative number art
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