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Masukkan nilai x = 3
9k + 3k - 36 = 0
12k = 36
k = 3
maka :
kx² + kx - 36 = 0
||
3x² + 3x - 36 = 0
faktorkan
3(x+4)(x-3) = 0
maka akar lain
x = -4
semoga membantu :)