-x^2 +5x-1=-(x^2 -5x+1)
=-(x^2 -2.2,5x+2,5^2)+5,25
=-(x-2,5)^2+5,25
Max=5,25<=>x=2,5
-x^2+5x-1=-x^2+5x-6,25+5,25=-(x-2,5)^2+5,25 ≤ 0+5,25=5,25
⇒GTLN là:5,25
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