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kx² + kx - 36 = 0
k3² + k3 = 36
k9 + k3 = 36
12k = 36
k = 3
Maka, persamaan yang terbentuk :
3x² + 3x - 36 = 0
atau
x² + x - 12 = 0
Sehingga, nilai akar lainnya :
x² + x - 12 = 0
( x + 4 ) ( x - 3 ) = 0
x = -4