AlgebraEasy–MediumDifference of two outputs of a linear function
Algebra practice question
The function f is defined by f(x) = 6 − 2x. What is the value of f(−1) − f(1)?
Answer: 4
f(−1) = 8 and f(1) = 4, so the difference is 4.
Common wrong answers
- If you answered 8
- 8 is f(−1) alone.
- If you answered 12
- 12 adds the two values.
- If you answered -4
- −4 subtracts in the wrong order.
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