> square the 1st term
>twice the product of the first and last term
>square the last term
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no
It can be factored as the SQUARE OF A BINOMIAL
It is not possible for a perfect square to have just 2 terms.
square of binomial
Yes, the chi-square test can be used to test how well a binomial fits, provided the observations are independent of one another and all from the same (or identical) binomial distribution.