What is the value of b for the following circle in general form? x2 + y2 + ax +by+c=0
1 answer:
Answer:
Step-by-step explanation:
<u><em>(1).</em></u> (x - <em>h</em> )² + (y - <em>k</em> )² = <em>r</em> ²
where <em>(h, k)</em> are coordinates of a center of the circle with radius <em>r</em>
<u><em>(2).</em></u> ( a ± b )² = a² ± 2ab + b²
~~~~~~~~~~~~~~
( 1 , - 2 ) ; r = 3
( x - 1 )² + ( y + 2 )² = 3²
x² - 2x + 1 + y² + 4y + 4 = 9
x² + y² - 2x + 4y - 4 = 0
a = - 2
b = 4
c = - 4
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