Find the equation of the circle that satisfies the following conditions. Express the final equation in the form x2 + y2 + Dx + Ey + F = 0.Tangent to the x axis, a radius of length 2, and abscissa of center is –1 

A. x2 + y2 - 2x - 4y + 1 = 0 and x2 + y2 - 2x + 4y + 1 = 0
B. x2 + y2 + 2x - 4y + 1 = 0
C. x2 + y2 + 2x - 4y + 1 = 0 and x2 + y2 + 2x + 4y + 1 = 0
D. x2 + y2 + 2x + 4y + 1 = 0
E. x2 + y2 - 2x + 4y + 1 = 0


Answer: C

Mathematics

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