Question

match the following ​

Answer 1

Answer:

$16) {a}^{2} - {b}^{2}$

please make me brainlist

Answer 2

$16.\ a^2-b^2= (a + b)(a - b)\\\\17.\ (a+b)^2 = a^2 + 2ab + b^2\\\\18.\ (a -b)^2 = a^2-2ab + b^2\\\\19.\ (\frac{a}{b})^0=1\\\\20.\ (\frac{a}{b})^{-n}=(\frac{b}{a})^n$