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a = 2
b = 5
c = 12
a + b = -b/a
= -5/2
ab = c/a = 12/2
= 6
x² - (a + b)x + ab
x² - (2a + 4 + 2b + 4)x + (2a + 4)(2b + 4)
x² - (2a + 2b + 8)x + (4ab + 8a + 8b + 16)
x² - (2(a + b) + 8)x + (4ab + 8(a + b) + 16)
x² - (2(-5/2) + 8)x + (4(6) + 8(-5/2) + 16)
x² - (-5 + 8)x + (24 - 20 + 16)
x² - 3x + 20
---> D.