11. Determine whether the given quadratic function has a maximum value or a minimum value, and then find the value. Note: The vertex of a concaved down parabola is a maximum and the vertex of a concaved up parabola is a minimum. a. f(x)= 2 b. f(x)=x²-8x+5 c. f(x)=-3x²-3x+1 x² - +4x+6 +4

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