Tolong dibantu ya kak no. 2&4 pakek caranya

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