The book A Treatise On Algebra was written by author Sestini, Benedict, 1816-1890 Here you can read free online of A Treatise On Algebra book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Treatise On Algebra a good or bad book?
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Because, substitating this value of x in each term of [e], we have, X" z= (u — »y/^T.)" = m' — «' n/— T-i Ai»-i = A(« — t)v^^^l)»-' = «" — t)"v'— 1. Bar»-' = = !4'" — t)"V— T^. &o. E = K. And therefore, x» 4- Aa^-'+ + K = U — Vv''^. But when a; ^ « + "v'— 1 is a root of [e] = 0, U and V are sepa- rately each equal to zero; hence, U — V^ — 1, as well as U 4- V y/ — 1, is equal to zero. But U — V^ — 1 is that which [e] becomes when « — »y/ — 1 is substituted for x ; hence, x = u — v^ — 1 is a roo...t of [«] = 0. Therefore, when one of the conjugate radical ex- pressions is a root of the equation, the other also is necessarily a root of the same equation. From this connection it follows, first, that the number Corollaries. of the roots of the imaginary form (o ± b^ — 1) must necessarily be even. Secondly, since whatever be the roots of [«] = 0, we have always [«] = (x — h)(x — i) (x — s)(x — t). Supposing that the first two, or four, or eight and so on, are imagi- nary, we will have for example, A = a -f- b-^/^^l, i= a — 6y/-^^ ; hence, (x—h)(x—i) = {x — a—b^—l)(x — a+b^^^) == (a; — o)'+ 6^, and, consequently, W = l(x-af + i^](x-l) (x-t).
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