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= (-b/a)² - 2(c/a) = (-(-1)/-2)² - 2(8/-2)
= 1/4 + 8 = 33/4
x1 × x2 = c/a = 8/-2 = -4
x² - (33/4 - 4)x + (33/4 × 4) = 0
x² - 17/4x + 33 = 0
------------------------ × 4
4x² - 17x + 132 = 0