Question 1014734
*[illustration dx4.JPG].
Use the determinant.
{{{D=b^2-4ac=(-10)^2-4(-1)(c)=100+4c}}}
For 2 roots, {{{D>0}}}
{{{100+4c>0}}}
{{{c>-25}}}
For 1 root, {{{D=0}}}
{{{c=-25}}}
For no roots,{{{D<0}}}
{{{c<-25}}}