Solving the Equation x^2 + 4x - 7 = 0 by Completing the Square

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Solving the Equation x^2 + 4x - 7 = 0 by Completing the Square
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How do I get the answer to 2 decimal places please?

riacook
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1:59 are we subtracting two from each side because the square root of 11 isn’t a perfect square?

mello.
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Can i ask why do we divide 4 by 2?
Is it a rule or something to divide the term "b" by 2?

radaimaadeel