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Donde: x = 2
y = - 3
2 (2)³ + 4 (2)² - 9 (2) (-3)
2 (8) + 4 (4) + 54
16 + 16 + 54
32 + 54
86
Okey:
2x³ + 4x² - 9xy para x = 2, y = -3
2(2)³ + 4(2)² - 9(2)(-3)
2(8) + 4(4) - 18(-3)
16 + 16 + 54
86