Question 315687
<pre><b>
{{{45a^2+150at+125t^2}}}

Factor out 5

{{{5(9a^2+30at+25t^2)}}}

Factor the trinomial in parentheses

{{{5(3a+5t)(3a+5t)}}}

Those binomial factors are the same so we can write the product
of it with itself as itself squared.

{{{5(3a+5t)^2}}}

Edwin</pre>