The book An Elementary Course in Analytic Geometry was written by author Tanner, J. H. (John Henry), B. 1861 Here you can read free online of An Elementary Course in Analytic Geometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Elementary Course in Analytic Geometry a good or bad book?
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79. In rectangular coordinates every equation of the form cc -+ 2/'^ + 2 Goc + 2 i^'i/ + C = represents a circle. The equa- tions of the circles already obtained (equations [31] and [32], as well as the answers to examples 1 to 5 and 7) are all of the form x^^-y'^ + 2ax+2Fy-{-C=0; . . . (1) it will now be shown that, for all values of ^, F^ and (7, for which the locus of equation (1) is real, this equation represents a circle. To prove this it is only necessary to complete the square in the ^-t...erms and in the ?/-terms, by adding G^ -f F^ to each member of equation (1), and then transpose C to the second member. Equation (1) may then be written in the form (x + G-y + (?/ + Ff = a'^ + F^- = (V(/2 + i^2_ (7)2 . , (2) which is (cf. equation [31]) the equation of a circle Avhose center is the point (— (r^, — ^), and whose radius is 138 ANALYTIC GEOMETRY [Ch. VII. Note 1. This circle is real only ii G^ + F^ - C>0; for, if G^+F-2- C
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