solve the equation x^2 - 4x +2=0 by completing the square
First we put the constant number to the right side:
x^2 - 4x = -2
Next, we divide the number in front of the x term by 2 and form a new squared binomial:
(x - 2)^2 = -2 + 4 We must add a 4 to the right side to account for the 4 on the left side
(x - 2)^2 = 2
Now, we take the square root of both sides to get
x - 2 = +/- √2
x = 2 + √2
x = 2 - √2
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