Answer
Centre = (-1, 2)
Radius = 3
Work Step by Step
$x^{2}$ + 2x + $y^{2}$ - 4y = 4
$(x+1)^{2}$ - 1 + $(y-2)^{2}$ - 4 = 4
$(x+1)^{2}$ + $(y-2)^{2}$ = 9
$(x+1)^{2}$ + $(y-2)^{2}$ = $3^{2}$
Centre = (-1, 2)
Radius = 3
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