The difference between 3 1/2 and 1 4/5 a 2 4/5 b 2 7/10 c 1 4/5 d 1 7/10
2 answers:
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when you use all prime, non-one numbers for b and c, it cannot be factored most of the time
example
1x^2+7x+5
a=1
b=7
c=5
x=
x=
x=
x=
x=
or 
example
1x^2+7x+5
a=1
b=7
c=5
x=
x=
x=
x=
x=