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Materi : Persamaan KuadratBahasan : Sifat Akar
Jawaban : E. 4
Langkah - langkah :
Akar yang sama / akar kembar memiliki D = 0, dimana D adalah b² - 4ac
kx² - 4x + 1 = 0
a = k
b = - 4
c = 1
(-4)² - 4(k)(1) = 0
16 - 4k = 0
- 4k = -16
k = 4