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49x^2+98x+36y^2+72y-15=049x^2+98x+4 -4 + 36y^2+72y+4 -4 -15=0(7x +2)^2 +(6x +2)^2 =23please check your equation, as the question seems to be incorrect,The standard equation is (x-x1)^2/a^2 - (y-y1)^2/b^2 =0focal length is given by = 2c = 2 Sqrt(a^2 +b^2)
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