Answer
$h^{2} - 100$
Work Step by Step
We use the formula for the difference of squares to apply to this question.
The difference of squares formula is:
$(a-b) (a+b) = a^{2} - b^{2}$
In the given formula let h represents a and 10 represents b.
$(h-10) (h+10) = (h)^{2} - (10)^{2}$
= $h^{2} - 100$
