(2013 · Anshun) it is known that one root of the equation x2-kx-6 = 0 about X is x = 3, then the value of real number k is () A. 1B. -1C. 2D. -2

(2013 · Anshun) it is known that one root of the equation x2-kx-6 = 0 about X is x = 3, then the value of real number k is () A. 1B. -1C. 2D. -2

Because x = 3 is the root of the original equation, we substitute x = 3 into the original equation, that is, 32-3k-6 = 0 holds, and the solution is k = 1