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f(x) = x² + 3x + (k-1)
y = x² + 3x + (k-1)
0 = x² + 3x + (k-1)
0 = (x+2)(x+1)
0 = x² + 3x + 2 ----> terus cocokin sama persamaan baris 3
2 = k-1
k = 3