Question

Solve by completing the square.
x^2 -20x=10
x=

Answer 1

divide coeefficient of x by 2 and subtract 10^2 from both sides:
(x - 10 )^2 -100 = 10-100
(x-10)^2 = 10
take sqrt of both sides and the rest is easy

Answer 2

http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e3c1bdd0b8bfc76a3f65023

Answer 3

x^2 - 20x + 100 = 110
(x - 10)^2 = 110
x-10 = \[\sqrt{110}\]
x=10\[\pm\]\[\sqrt{110}\]