Question 1007604
The question is the{{{ sqrt( (4s^2)+(16t^2) ) }}}
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Actually, that's not a question.  It's just an expression.
If you want to simplify it:
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{{{ sqrt(4s^2 + 16t^2) = sqrt(4*(s^2 + 4t^2))}}}
= {{{sqrt(4)*sqrt(s^2 + 4t^2))}}}
{{{sqrt(4) = 2}}}
= 2{{{ sqrt( (s^2)+(4t^2)) }}}