Rational and logical are quite similar in meaning but rational is something that has logic. These two words are close synonyms and not antonyms.
Answer:
Their father buys for them cloth
The simplified expression is 
Explanation:
The expression that we have in this problem is

We want to simplify this expression: in order to do so, we apply the rule to solve the square of a binomial:

Where in our expression, we have:

So, the various terms are:

Therefore, the final expression becomes

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