Question 1163551
<pre>

 ∛a * ∜a 

{{{root(3,a)*root(4,a)}}}

{{{matrix(2,1,"",a^(1/3)*a^(1/4))}}}

add the exponents:

{{{matrix(2,1,"",a^(1/3+1/4))}}}

Get LCD of 12:

{{{matrix(2,1,"",a^(4/12+3/12))}}}

{{{matrix(2,1,"",a^(7/12))}}}

{{{root(12,a^7)}}}

Edwin</pre>