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(k+13)(3²)+3k +27=0
(k+13)(9)+3k=-27
9k + 117 + 3k =-27
12k = -27-117
12k = -144
k = -144/12
k=-12
(-12+13)x²+(-12)x + 27=0
x²-12x+27=0
(x-9)(x-3)=0
x=9 atau x=3
jadi salah satu akar lainya adalah 9