Jawabanmu

Jawaban paling cerdas!
2014-06-17T15:56:15+07:00
Diketahui :
x² - 9x + (k-4)= 0 dan x1 = 2x2
x1 + x2 = -b/a = 9
2x2 + x2 = 9
3x2 = 9 , maka x2 = 9/3 = 3

x1x2 = c/a = k-4
2x2(x2) = k - 4
2(3)(3) = k - 4
18 = k - 4
k = 18 + 4
Jadi, nilai k = 22
2 4 2