Question

What is the radius of (x + 1)2 + (y - 3)2 = 9?

Question 1 options:

81


1


9


3

Answer 1

easy
the equation of a circle with center at (h,k) and radius r is

(x-h)²+(y-k)²=r²

we are given
(x+1)²+(y-3)²=9
(x+1)²+(y-3)²=3²

radius is 3