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a+b = -4
a.b = k-4
a = 3b
substitusi
a+b = -4
3b+b = -4
4b = -4
b = -1
a = 3(-1)
a = -3
a.b = k-4
(-3).(-1) = k-4
3 = k-4
k = 3+4
k = 7
semoga membantu ya :)