The maximum value of 4x -- 5x2 + 1 is
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=-5'(x2-2x-)-1=-5(x2-2x+1-1)-1 =-5(x-1)2+5-1 =4-5(x-1)2 Since(x-1)2>=O -5(x-1)2<=0
4-5(x-1)2<=4
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