Solve x2 = 144. 72 12 ±12 - 12

If x²=144, then x = positive 12 and x = negative 12.

I have no idea what the '72' is doing in there.

If it means x²=144.72, then

x = + / - 12.03 (rounded)

Oh wait. Now I understand what the 72 is. It's one of the answer choices.

Specifically, it's the customary absurd choice for students who have no clue.