The Elements of Plane And Solid Analytic Geometry

Cover The Elements of Plane And Solid Analytic Geometry
The Elements of Plane And Solid Analytic Geometry
Albert L Albert Luther Candy
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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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