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VTMO 2015 — Grade 9 — semifinal Question 8

VTMO · VTMO 2015 — Grade 9 — semifinal

Question 8

There are two a values for which $4 x^{2} + ax + 8 x + 9 = 0$ has a double root. Find their sum.
  1. $- 16$
  2. $- 8$
  3. $8$
  4. $13$
  5. $16$