Question

What is the radius of a circle whose equation is (x 5)2 (y – 3)2 = 42?

A. 2 units
B. 4 units
C. 8 units
D. 16 units.

Answer 1

4 units is the awser

Answer 2

B. 4 units

Explanation:

(x- 5)^2 +(y – 3)^2 = 4^2

This equation is in the form

(x-h)^2 + (y-k) ^2 = r^2

where (h,k) is the center and r is the radius

The radius is 4