Question 1209352
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Notice that {{{sqrt(4)}}} = 2.


Then equation takes the form

    x^2 - 2x - 3 = 2.


Simplify it to

    x^2 - 2x - 5 = 0.


Now apply  the quadratic formula

    {{{x[1,2]}}} = {{{(2 +- sqrt(2^2 - 4*1*(-5)))/2}}} = {{{(2 +- sqrt(24))/5}}}.


There are two roots  {{{(2 + sqrt(24))/5}}}  and  {{{(2 - sqrt(24))/5}}}.



Now you can solve by similar way for the case  {{{sqrt(4)}}} = -2.
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Happy calculations !