Question 156662
{{{sqrt(x + 3) = 2*sqrt(x)}}}
square both sides
{{{x + 3 = 4x}}}
subtract {{{x}}} from both sides
{{{3x = 3}}}
{{{x = 1}}}
check:
{{{sqrt(x + 3) = 2*sqrt(x)}}}
{{{sqrt(1+ 3) = 2*sqrt(1)}}}
{{{2 = 2}}}
OK