Question

The equation of a circle is x2+y2+10x−4y−20=0 .


What is the radius of the circle?


Enter your answer in the box.

Answer 1

Answer:

7

Step-by-step explanation:

Let's start by converting this to standard form.

$x^2+10x+y^2-4y=20\\(x^2+10x+25)-25+(y^2-4y+4)-4=20\\(x+5)^2+(y-2)^2=49$

The center of the circle is at (-5,2), and the radius is $\sqrt{49}=7$ units. Hope this helps!

Answer 2

Answer:

Here is the correct answer! Hope I helped! Sorry I am late! Really helpful for k12 users!

Step-by-step explanation: