Question 1151658
<pre>
{{{ y = 2^(log(4,(x))) }}}

Take log_2 both sides:
{{{ log(2,(y)) = log(4,(x)) }}}

Raise 4 to both sides:
{{{ 4^(log(2,(y))) = x }}}

Re-write left hand side:
{{{ 2^(2(log(2,(y)))) = x }}}
{{{ y^2 = x }}}
{{{ y = sqrt(x) }}}