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Riddle puzzle: Domain and range

Solve each question. Find your answer in the decoder and write its letter in the box. The letters answer the riddle.

Name

Date

Why did the student do times tables on the floor?

  1. 1.What is the domain of f(x) = 1/(x + 2) (real numbers only)?
  2. 2.What is the smallest x in the domain of f(x) = √(5x − 5)?
  3. 3.What is the smallest x in the domain of f(x) = √(2x + 2)?
  4. 4.What is the smallest x in the domain of f(x) = √(3x + 12)?
  5. 5.What is the smallest x in the domain of f(x) = √(5x + 10)?
  6. 6.What is the domain of f(x) = √(x + 3) (real numbers only)?
  7. 7.What is the domain of f(x) = √(−8 − x) (real numbers only)?
  8. 8.What is the smallest x in the domain of f(x) = √(4x − 8)?

Decoder

2S

-2B

-4A

x > −3Q

x ≤ −8E

-1T

x ≠ 6J

x ≥ −3L

x ≠ −2N

x > −7X

x ≠ −1Z

1O

The answer to the riddle

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8

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Answer key: Domain and range riddle

Why did the student do times tables on the floor? No tables!

  1. 1. x ≠ −2 = N
  2. 2. 1 = O
  3. 3. -1 = T
  4. 4. -4 = A
  5. 5. -2 = B
  6. 6. x ≥ −3 = L
  7. 7. x ≤ −8 = E
  8. 8. 2 = S

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