If y = 4x - 1, list the range of the domain -2 ≤ x ≤ 2, where x is an integer.

Correct Answer is : {-9, -5, -1, 3, 7}

Correct Answer is : {-9, -5, -1, 3, 7}

Test Index

WAEC Further Mathematics 2016 Paper

Question : 6

Total: 40

y = 4x - 1

-2 \leq x \leq 2

, where x is an integer.

Solution:

Concept:

The domain values are integers from

-2

2

The range is the set of corresponding

y

values from

y = 4x - 1

Explanation:

List the integer domain values:

x = -2, -1, 0, 1, 2

Substitute each into

y = 4x - 1

For

x = -2

y = 4(-2) - 1 = -9

For

x = -1

y = 4(-1) - 1 = -5

For

x = 0

y = 4(0) - 1 = -1

For

x = 1

y = 4(1) - 1 = 3

For

x = 2

y = 4(2) - 1 = 7

Therefore, the range is

\{-9, -5, -1, 3, 7\}

Answer:

\{-9, -5, -1, 3, 7\}

which is option D.

Go to Question:

Prev Question

Next Question