Answer :
[tex]a^2+2b-3c[/tex]
a= -2, b=5 and c=10
[tex]\begin{gathered} we\text{ just ne}ed\text{ to substitute } \\ (-2)^2+2(5)-\text{ 3}(10) \\ 4+10-30 \\ =14-30 \\ =-16 \end{gathered}[/tex]