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a = 2
b = -9
c = c
D = b² - 4ac
b² - 4ac = 121
(-9)² - 4(2)(c) = 121
81 - 8c = 121
-8c = 121 - 81
-8c = 40
8c = -40
c = -40 / 8
c = -5
D=121
121=(-9)^2 - 4(2)c
121=81-8c
8c=-40
c=-5