b. a = -2 , b = 5, (x,y) = (3,-7)
r² = (3-(-2))² + (-7-5)²
r² = (3+2)²+(-12)²
r² = 5²+12²
r² = 25+144
r² = 169
(x-a)²+(y-b)² = r²
(x+2)²+(y-5)² = 169
x²+4x+4 + y²-10y +25 = 169
x²+y²+4x-10y+29 = 169
x²+y²+4x-10y-140 = 0
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b. a = -2 , b = 5, (x,y) = (3,-7)
r² = (3-(-2))² + (-7-5)²
r² = (3+2)²+(-12)²
r² = 5²+12²
r² = 25+144
r² = 169
(x-a)²+(y-b)² = r²
(x+2)²+(y-5)² = 169
x²+4x+4 + y²-10y +25 = 169
x²+y²+4x-10y+29 = 169
x²+y²+4x-10y-140 = 0