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VTMO 2013 — Grade 9 — semifinal Question 5

VTMO · VTMO 2013 — Grade 9 — semifinal

Question 5

Find a such that $x^{2} + ax + a - 1 = 0$ has exactly one real root.
  1. $0$
  2. $- 1$
  3. $1$
  4. $2$
  5. $- 2$