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2013-06-29T11:58:16-03:00

x-3=2√x
(x-3)²=(2√x)²
x²-6x+9=4x
x²-6x+9-4x=0
x²-10x+9=0
x=[10+-√(100-36)]/2
x=[10+-√(64)]/2
x=[10+-8]/2
x'=[10+8]/2=18/2=9
x"=[10-8]/2=2/2=1
N= 9

4 4 4