Question 1013006
when k = 2, the equation of x^2 - (k-2)x - 12 = 0 becomes x^2 - -0x - 12 = 0 which becomes x^2 - 12 = 0.
add 12 to both sides of this equation to get x^2 = 12.
take the square root of this equation to get x = plus or minus sqrt(12).