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solve the equation  x^2 - 4x +2=0 by completing the square

Apr 8th, 2015

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

Apr 8th, 2015

Thanks for the quick answer ! 

Apr 8th, 2015

No problem ;)

Apr 8th, 2015

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