Question

PLEASE HELP! I HAVE A CHAPTER TEST TM ON THIS

Answer 1

Answer:

$a{}^{2} - {b}^{2} = {c}^{2}$

$12 {}^{2} - (3 \sqrt{7})^{2}$

$144 - 63 = 81$

$\sqrt{80 } = 9$

Answer 2

Answer:

sorry for dirty handwriting