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(k+3) x² + 2k (x+1) + 3 = 0
(k+3) x² + 2k x + 2k + 3 = 0
a= k+3 , b = 2k, c = 2k+3
setengah dari kebalikan akar lainnya :
4k+6 = k+3
3k = - 3
k = -1