Question #3c24d

1 Answer
Apr 12, 2017

(5-h)(5+h)

Explanation:

First, note that 25 is a square number, namely 25=5^2

Second, be aware of this expansion, a^2-b^2=(a+b)(a-b), and this expansion is known as the "difference of two squares", because you are subtracting one square number from another.

Applying this, we see that:
25-h^2=5^2-h^2
=(5-h)(5+h)