Question

What is the equation of a circle with center (1,-4) and radius 2?A. (x - 1)2 + (x+4)2 = 4B. (x - 1)2 + (x +4)2 = 2C. (x+1)2 + (y - 4)2 = 4D. (x - 1)2 - (y + 4)2 - 4SUBMIT

Answer 1

Okay, here we have this:

Considering that the equation of a circle is:

(x-h)²+(y-k)²=r² with the center being at the point (h, k) and the radius being r.

Replacing we obtain:

(x-1)²+(y-(-4))²=2²

(x-1)²+(y+4)²=4

Finally we obtain that the correct answer is the option A.