The Invisible-Parentheses Error
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The invisible-parentheses error reads −3² as (−3)² and answers 9; the parentheses are not there, and the value is −9.
Show
On an exam line, −5² + 25 equals 0, not 50. The error adds parentheses the problem never wrote.
Watch for
Calculators disagree on this keystroke; the notation does not.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.