If we put 

then 

and re-write the equation:

y^2 + 5y + 6 = 0

We will get the following solution for 'y':

Click here to see the step by step solution for 'y'.

Now, lets go back to 'x' and solve the equations:

We will get the solution for 'x'.

Click here to see the bellow step by step solution of the equation:

Click here to see the bellow step by step solution of the equation:

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There are two solutions for x: x1 = -8 and x2 = -27.