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what is the answer by solving with complete a square s^2+4s+9=0

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Jeonelvieviz
s²+4s+9=0
s²+4s=-9
s²+4s+[1/2(4)]²=-9+[1/2(4)]²
s²+4s+4=-9+4
(s+2)²=-5
s+2=√-5
s+2=(positive and negative) i√5
s= -2 + i√5
s= -2 - i√5