Question #3c24d

1 Answer
Apr 12, 2017

Answer:

#(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)#