+118723 What calc?
On the web2 calc you can do it like this
log(225)-3log(12)/log(12)
$${log}_{10}\left({\mathtt{225}}\right){\mathtt{\,-\,}}{\frac{{\mathtt{3}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{12}}\right)}{{log}_{10}\left({\mathtt{12}}\right)}} = -{\mathtt{0.647\: \!817\: \!481\: \!888\: \!637\: \!3}}$$
+118723 What calc?
On the web2 calc you can do it like this
log(225)-3log(12)/log(12)
$${log}_{10}\left({\mathtt{225}}\right){\mathtt{\,-\,}}{\frac{{\mathtt{3}}{\mathtt{\,\times\,}}{log}_{10}\left({\mathtt{12}}\right)}{{log}_{10}\left({\mathtt{12}}\right)}} = -{\mathtt{0.647\: \!817\: \!481\: \!888\: \!637\: \!3}}$$
