Answer :
[tex]\frak{Hi!}[/tex]
[tex]\orange\hspace{300pt}\above0.8[/tex]
We have the expression-:
[tex]\boldsymbol{\sf{f(n)=n^2-n}}[/tex], and we should evaluate that for
[tex]\boldsymbol{\sf{f(-4)}}[/tex]. To do that simply put in the value for x-:
[tex]\boldsymbol{\sf{f(-4)=(-4)^2-(-4)=16+4=20}}[/tex]
done!!
[tex]\orange\hspace{300pt}\above3[/tex]