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b. 2x² + 7x - 4 = (2x-1)(x+4)
c. x² + x - 30 = (x-5)(x+6)
d. 3x² + 8x - 3 = (3x-1)(x+3)
e. 2x² + 5x - 3 = (2x-1)(x+3)