2a^2+12a+18=0
D=144-4*2*18=0
a=-12/4=-3
2(a+3)^2
2a^2+12a+18=2*(a+3)^2
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2a^2+12a+18=0
D=144-4*2*18=0
a=-12/4=-3
2(a+3)^2
2a^2+12a+18=2*(a+3)^2