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D=b²-4ac
(-1)²-4(2)(4c-1)=0
1-32c+8=0
9=32c
c=32/9
D = (-1)² -4(2)(4c-1)
1 -8(4c -1) = 0
1 - 32c + 8 = 0
9 - 32c = 0
-32c = -9
c = -9/-32
c = 9/32