Question

how would #8 be written out

Answer 1

It would be written out as "number eight".

Answer 2

$30-3x^2$ 

$30-3(3)^2$  $Substitute \ x \ for \ 3$ 

$Use \ Product \ Rule: \ x^ax^b=x^a^+^b$ 

$30-3^3$ 

$30 - 27$ 

$x=3$