Spreadsheets contain pitfalls for the unwary. (a) If cell A1 contains the value 5, what would you

Question:

Spreadsheets contain pitfalls for the unwary.
(a) If cell A1 contains the value 5, what would you expect the formula = −A1^2+A1^2 to give?
(b) Using Excel, enter 5 in cell A1, enter = −A1^2+A1^2 in cell A2, and enter = +A1^2−A1^2 in A3. What results do you get?