Question 424586
{{{ sqrt(x+1)= x-1 }}}
square both side:
{{{ x+1 = (x-1)^2 }}}
{{{ x+1 = (x-1)(x-1) }}}
{{{ x+1 = x^2-2x+1 }}}
{{{ 1 = x^2-3x+1 }}}
{{{ 0 = x^2-3x }}}
{{{ 0 = x(x-3) }}}
x = {0, 3}