Advanced MathEasy–MediumEquation for a table that doubles the square
Advanced Math practice question
The table shows values of a function. x | y 1 | 2 2 | 8 3 | 18 Which equation describes y in terms of x?
- A. y = 2x²Correct
- B. y = 2x
- C. y = x² + 1
- D. y = 6x − 4
Answer: A. y = 2x²
2(1) = 2, 2(4) = 8, 2(9) = 18.
Why the other answers are wrong
- B. y = 2x
- 2x gives 2, 4, 6.
- C. y = x² + 1
- x² + 1 gives 2, 5, 10.
- D. y = 6x − 4
- 6x − 4 gives 2, 8, 14; the last row fails.
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