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= 8x⁴ - 6x² + 5
b.(3x - 8) (2x + 7)
= 3x(2x + 7) - 8(2x + 7)
= 6x² + 21x - 16x - 56
= 6x² + 5x - 56
b. 6xpangkat2 - 21x - 16x - 56
6xpangkat2 -37x - 56