The book The Elements of Plane And Solid Analytic Geometry was written by author Albert L Albert Luther Candy Here you can read free online of The Elements of Plane And Solid Analytic Geometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Elements of Plane And Solid Analytic Geometry a good or bad book?
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Therefore, since the graph of f(x) is a continuous curve ( 64), in passing from A to B along the graph the x-axis will be crossed an even number, or an odd number, of times according as /(a) and f(b) have the same sign, or opposite signs. This proves the proposition. (An even number includes the case of no roots. ) E. G. If /(x) = x* - 3x + 1, then /(I) = - 1 and/(2) = 3. , -. At least one real root of x 3 3x + 1 =0 lies between 1 and 2. 71. ^Ln equation of an odd degree 7ias at least one real ...root. Let the given equation be Let a be a positive value of x sufficiently large to make the first term of /(a) greater than the sum of all the other terms ( 69). Then the sign of /(a) will be the same as the sign of a 2?l+1, i. E. The same as the sign of a. Hence if a be sufficiently great, f(a) is positive, /(O) =p 2n +i> and /( a) is negative. Therefore in all cases there is one real root, which is positive or negative according as p 2n+l is negative or positive ( 70). 78] THEORY OF EQUATIONS 89 Hence the graph of a function of an odd degree in the standard form extends to infinity in the first and third quadrants.
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