finding restrictions: 4a^2-b^2-2a+b / (2a+b)^2-1  TOPIC_SOLVED

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finding restrictions: 4a^2-b^2-2a+b / (2a+b)^2-1

Postby foood on Thu Dec 15, 2011 5:53 pm

ok i understand how to solve the problem, but i dont get how to get the restrictions.

i have to solve this problem and then put restrictions on it
4a^2-b^2-2a+b / (2a+b)^2-1

the answer is 2a+b / 2a+b+1
but on my answer sheet the restrictions also says b is not equal to 1-2a and -(2a+1)
my teacher also said it is 2a+b not equal to -1

i dont know how to find restrictions -____-
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Postby stapel_eliz on Thu Dec 15, 2011 11:19 pm

foood wrote:ok i understand how to solve the problem, but i dont get how to get the restrictions.

Assuming "solve" means "simplify", the restrictions come from the factors you cancelled off. They had zeroes which would have caused division by zero. When you cancelled them off, you changed the domain.

Put those restrictions (that is, the values that would originally have caused division by zero) back in to make the simplified form match the original form. :wink:
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