Respuesta :

It would be written out as "number eight".
[tex]30-3x^2[/tex] 

[tex]30-3(3)^2[/tex]  [tex]Substitute \ x \ for \ 3 [/tex] 

[tex]Use \ Product \ Rule: \ x^ax^b=x^a^+^b[/tex] 

[tex] 30-3^3 [/tex] 

[tex]30 - 27[/tex] 

[tex]x=3[/tex]