Question

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

2 units
4 units
8 units
16 units

Answer 1

I would recommend double checking the question and answer choices

but anyway, (x-h)^2 + (y-k)^2 = r^2, compare this to your equation and see what r would be

Answer 2

... oh, I just realized it's supposed to be 4^2 not 42