Question

Which is an equation of a circle with center (2, -1) that passes through the point (3, 4)?

A.(x + 2)2 + (y - 1)2 = 13
B.(x - 2)2 + (y + 1)2 = 13
C.(x - 2)2 + (y + 1)2 = 26
D.(x + 2)2 + (y - 1)2 = 26

Answer 1

Hello,

(x-2)²+(y+1)²=R²
if x=3 ,y=4 ==>(3-2)²+(4+1)²=R²==>R²=16

The equation is (x-2)²+(y+1)=26

Answer C