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Proving Polynomial Identities

Proving Polynomial Identities 1.8 - Solution

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a
We have a positive sign inside of the parentheses, we'll use the positive squared binomial. In our expression the variables corresponds to and Note that the entire term is to be raised by
Simplify power and product
b
Again, we use the positive squared binomial, since there is a positive sign inside the parentheses.
Simplify power and product

Alternative Solution

Use the negative squared binomial
We should also be able to expand the expression using the negative squared binomial if we change the order of terms inside the parentheses.
Simplify power and product
We got the same answer, but the terms ended up in a different order.