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a= 1
b= -8
c= c
agar mempunyai penyelesaian tunggal maka x1 = x2
x1 = x2 bila D = 0
D = b^2 - 4ac
0 = (-8)^2 -4(1)(c)
0 = 64 - 4c
4c=64
c = 64/4
c = 16