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Ax² +(B- 3A)x +(-3B) = 4x² -11x - 3
A= 4
-3B = -3 --> B = 1
A+B = 4+1 = 5
5)
(x+5)(Ax+B) = 2x² + 7x - 15
Ax² + (5A+B)x +(5B) = 2x² + 7x - 15
A= 2
5B = -15 --> B = -3
nilai A.B = (2)(-3) = -6