factorise : x² - 4x - 8
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=> x^2 - 4x - 8 = 0
=> x^2 - 4x = 8
Adding 4 on both sides
=> x^2 - 4x + 4 = 8 + 4
=> x^2 - 4x + 4 = 12
=>( x - 2)^2 = 12
=> x -2 = root 12
=> x - 2 =2 root 3
=> x = 2 + 2 root 3