gary-davis_60bd06cb82e33
gary-davis_60bd06cb82e33
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x² + y² - 4x + 10y + 13 = 0......=> kx=-4.....ky=+10....k=+13 a= kx/-2 = -4/-2 = 2 > b= ky/-2 = 10/-2 = -5 > r²=a²+b² -k = 2²+(-5²) -13 = 4+25-13= 16 > (x-a)² + (y-b)² = r² (x-2)² + (y+5)² = 16 >>