Hello!
[tex]\rm{4x^2\:for\:x=3}[/tex]
- [tex]\bf{Plug\:in\:-3\:for\:x.}[/tex]
[tex]\hookrightarrow\rm{4(-3)^2}[/tex]
- [tex]\bf{Evaluate.\;Square\;-3\;first.}[/tex]
[tex]\hookrightarrow\rm{4(9)}[/tex]
- [tex]\bf{Multiply.}[/tex]
[tex]\hookrightarrow\rm{36}[/tex]
Therefore, the answer is [tex]\boxed{\boxed{\bf{36}}}[/tex].
Hope it helps!
Enjoy your day!
[tex]\boxed{\rm{Cordelia}}[/tex]
