Answer :
We notice that the given equation can be written as:
[tex]\begin{gathered} x^2+x-2=0 \\ \text{factoring } \\ (x+2)\text{ (x-1)=0} \end{gathered}[/tex]Then the roots are -2 and 1 , if we add them we get -1.
We notice that the given equation can be written as:
[tex]\begin{gathered} x^2+x-2=0 \\ \text{factoring } \\ (x+2)\text{ (x-1)=0} \end{gathered}[/tex]Then the roots are -2 and 1 , if we add them we get -1.