Table 2
Interval
Test Number
Value of \({x^{2}-4x}+{3}\)
Sign of \({x^{2}-4x}+ {3}\)
\( ( -\infty ,1)\)
\({0}\)
\({3}\)
Positive
\( (1,3)\)
\({2}\)
\({-1}\)
Negative
\(( 3,\infty )\)
\({4}\)
\({3}\)
Positive