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Spec: ERR2 · No calculator · ~150s
Letters only — the answer key is hidden. Work it out, then check the solution below.
No written hint yet — check the trope: divide-by-zero, cancel-zero-factor. Name the trap first, work the stem by hand, then open the solution below.
Same topic · same level
TMUA-P2-ERR2-001
A student argues: “If ab = ac then b = c, just divide both sides by a.” For which values does this implication fail, and…
Common fallacies
Same trap: cancel-zero-factor
TMUA-P2-ERR2-013
A student solves 2x(x+1)=x+1 by cancelling (x+1) to get x=12 only. What is the full solution set?
Common fallacies
Step up a level
TMUA-P2-ERR2-004
A student solves -2x > 6 by dividing both sides by -2 to get x > -3. What is the error?
Common fallacies