how to take out the square root by completing the squares method

In completing squares method, we convert the given equation involved with one of the identities,
(a+b)2=a2+2ab+b2 (or)
(a-b)2=a2-2ab+b2

I am providing two examples to undersatnd
Example -1:
find the roots of the equation x2 - 8x -20 = 0 by the method of completing the square

Solution:


Example-2:
Solve the equation 5x^2 - 6x - 2 = 0 by the method of completing the square.

Solution:

Given, 5x2 - 6x - 2 = 0

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