Question

If the equation x^2-kx+3k=0 has exactly 1 solution for "x", which of the following could be "k"?

4

6

9

12

18

Answer 1

b^2-4ac has to be 0

Answer 2

what?

Answer 3

use the discriminant?

Answer 4

solve it. you need one solution, so you need discriminant to be 0

Answer 5

hmmmm..... but this equation is structured a little differently

Answer 6

b^2-4ac=0 so (-k)^2-4*1*3k=0 k^2-12k=0

Answer 7

k(k-12)=0 k=0 or k=12

Answer 8

so k=12

Answer 9

thank u. i'll need 2 remember this for future reference. thanx, bro

Answer 10

generally... remember that

Answer 11

thanx, anyway, bro

Answer 12

no matter k's and stuff