Y = x ^ 3-3ax + 2 1 "extremum? 2" to find x ^ 3-3ax + 2 = 0, what is the value of a, there are three different real roots? When do you have two different real roots? When do you have a unique root

Y = x ^ 3-3ax + 2 1 "extremum? 2" to find x ^ 3-3ax + 2 = 0, what is the value of a, there are three different real roots? When do you have two different real roots? When do you have a unique root

1) If y '= 3x & # 178; - 3a, when y' = 0, y takes the extremum, that is, 3x & # 178; - 3A = 0x = ± a, and then we can find the extremum: y = A & # 179; - 3A * a + 2 = A & # 179; - 3A & # 178; + 2Y = (- a) & # 179; + 3A * a + 2 = 3A & # 178; - A & # 179; + 2) if the equation has three different roots, the extremum of function y must be obtained