Find the extremal values of the functions (a) y = x 2 + x + 1 (b)

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Find the extremal values of the functions

(a) y = x2 + x + 1 

(b) y = 3x2 – 2x – 1

(c) y = 4 + 3x – x2 

(d) y = 2x – 1 – 2x2

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