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proc qf {a b c} {
if {$a == 0} {error "Denominator can not be zero"}
set s [expr sqrt($b*$b-4*$a*$c)]
set d [expr 2*$a]
list [expr (-$b+$s)/$d] \
[expr (-$b-$s)/$d]
}
qf 1 0 -2
catch {qf 0 0 -2} roots
set roots
puts $roots
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