How is exponential growth and decay used in everyday life?

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

Can someone me out here and the tell me the greatest common factor

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28