How do you find the 1st term in the expansion of $(a+b)^5$ ?

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Answer 1 · 2016-08-15T21:33:33

$a^5$

The first term will be the product of the first terms of 5 brackets.
As the coefficient is 1, the 5th power of 1 = 1.

$1a^5 = a^5$

In the same way, the last term will be $b^5$

How do you find the 1st term in the expansion of (a+b)^5(a+b)^5?