Question 49424
First, add 4 to both sides of the equation to produce {{{ x^2 -4 +4 =3+4 }}}, which simplifies to {{{ x^2 = 7 }}}.  Take the square root of both sides produces {{{ sqrt(x^2) = sqrt(7) }}}, which simplifies to {{{ x = sqrt(7) }}}.  If you need to compute the actual square root of 7, get a calculator, or find it in a table of square roots (usually in the back of algebra books).  By the way, the square root of 7 is 2.64575.