x²-8x+18=/(x-4)²-16+18/=(x-4)²+2
(x-4)²≥0, (x-4)+2≥2 , x∈R
min (x-4)²+2=2 ⇔ x=4
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x²-8x+18=/(x-4)²-16+18/=(x-4)²+2
(x-4)²≥0, (x-4)+2≥2 , x∈R
min (x-4)²+2=2 ⇔ x=4