SOLUTION: don't understand how to solve for x: (x-b)2 = 4b2 book says 3b, -b don't know how to get to that answer

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Question 305290: don't understand how to solve for x:
(x-b)2 = 4b2
book says 3b, -b
don't know how to get to that answer
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28x-b%29%5E2+=+4b%5E2
Take the square root of both sides,
x-b=0+%2B-+2b
x=b+%2B-+2b
x=-b and x=3b