[STEP][剑桥数学入学考试][02-S1-Q1][Simultaneous equations][Equation of Circle][P1] STEP

casperyc的马甲 7月前 648

Show that the equation of any circle passing through the points of intersection of the ellipse $(x+2)^2 +2y^2 =18$ and the ellipse $9(x-1)^2 + 16y^2 = 25$ can be written in the form $$ x^2-2ax +y^2 =5-4a . $$

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