Question

Question #3c24d

Answer 1

`(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)`