Jawabanmu

2014-05-18T21:05:03+07:00
D  \geq 0
(k+5)² - 4(5k+4)  \geq 0
k² + 10k + 25 - 20k - 16  \geq 0
k² - 10k + 9  \geq 0
(k - 1) (k - 9)  \geq 0
 k = 1 atau k = 9

HP = {k  \leq 1 atau k  \geq 9}







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