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2

Step-by-step explanation:

The maximum  (since this is a downward opening parabola ) is at the axis of symmetry

The axis of symmetry is at

h = -b/2a  where a is the x^2 coefficient and b is the x coefficient

   = -2/(2*-1)

   -2/-2

  = 1

The maximum occurs at x=1

Substitute this into the equation to find the maximum value

y = -(1)^2 +2(1) +1

   =-1+2+1

  = 2

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step-by-step explanation:

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the square root of what number? if you add that, then someone will probably answer the question.