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Jadi faktornya (3x + 4) dan (x - 5)
axc= -60~~> -15x4
b = -11~~> -15+4
3x^2-15x+4x-20
(3x^2-15x)(4x-20)
3x(x-5) 4(x-5)
3x+4(x-5)
(3x-4)(x-5)