Question

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

Answer 1

Answer: 4 Units

Explanation:

we know that

The Standard Form Equation of a Circle is equal to

where

(h,k) is the center of the circle

r is the radius of the circle

In this problem we have

therefore

the center is the point

the radius is  4 units

the answer is 4 units

Answer 2

Answer:

Explanation:

Find x and y simultaneously and then find the magnitude whose formula is r = (x² + y²)½ or under root