12+40x56-56= pls help me

Complete the square to determine the minimum or maximum value of the function defined by the expression. x2 − 12x − 2 a) maximum value at 38 b) minimum value at 38 c) maximum value at −38 d) minimum value at −38

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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