Expand the following:
$\left(x-7\right)\left(x+7\right)$(x−7)(x+7)
Expand $\left(10-m\right)\left(m+10\right)$(10−m)(m+10).
Expand the following perfect square: $\left(x+3\right)^2$(x+3)2
Expand the following using binomial expansion:
$\left(x+5\right)\left(x+7\right)$(x+5)(x+7)