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3x² - 4x - 8 = 0, a = 3, b = -4, c = -8
b.
x² - 2x - 1 = 0, a = 1, b = -2, c = -1
c.
2x² + x - 16x - 8 = 3
2x² - 15x - 8 - 3 = 0
2x² - 15x - 11 = 0, a = 2, b = -15, c = -11
d.
x² - 2x + 1 = 5
x² -2x + 1 - 5 = 0
x² - 2x - 4 = 0, a = 1, b = -2, c = -4