Jawapan

  • Pengguna Brainly
2016-02-03T23:05:26+08:00
9x^2 + 3kx - k = 0 
a = 9 , b = 3k , c = - k
b^2 - 4ac = 0
(3k)^2 - 4(9)(-k) = 0
9k^2 - 36(-k) = 0
9k^2 + 36k = 0
k = 0 , k = - 4
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