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a=2
b = -9
c=c
D = 121
b²-4ac = 121
(-9)²-4(2)(c)=121
81-8c=121
81-121=8c
-40 = 8c
c = -5
Dari persamaan diketahui bahwa a =2, b = -9,
Maka 121 = 81 - 4*2.c
121 -81 = 8c
40 = 8c
c = 5