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SMO 2017 Senior Round 1 Question 9

SMO · SMO 2017 Senior Round 1

Question 9

If $f(x)=-x+6\sqrt{x+16}-5$, where $-16\le x\le0$, find the range of $f(x)$.
  1. $-29\le f(x)\le20$
  2. $-29\le f(x)\le19$
  3. $11\le f(x)\le19$
  4. $19\le f(x)\le20$
  5. $11\le f(x)\le20$