Which is an equation of the circle with a radius of 9 units and center at (–4, 2)? a. (x − 9)2 + (y + 4)2 = 4 b. (x − 4)2 + (y + 2)2 = 81 c. (x + 4)2 + (y − 2)2 = 81 d. (x − 2)2 + (y + 4)2 = 81

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

This circle is not centered at the origin.

The point we want is in the form

(h, k).

We are given that h = -4 and k = 2.

We also know that the radius is 9.

Let r = 9 leading to (9)^2 or 81.

We know substitute in the form given above for circles not centered at the origin.

(x - (-4)^2 + (y - 2)^2 = 81

(x + 4)^2 + (y - 2)^2 = 81

Choice C

15 batches are the most you can make

step-by-step explanation:

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