Find the equation of a circle with a center at (-7,-4) and tangent to the x-axis.

I am having trouble understanding and solving this problem.

For a similar problem, I had to find the equation of a circle with center at (4, 5) and radius 6. For this problem I used standard form and solved as (x - 4)^2 + (y - 5)^2 = 36. But I can't figure out how to take this concept and solve for the first equation. Thx. for any help.

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