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WAEC Further Mathematics 2016 Paper

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Question : 6

Total: 40

If

y = 4x - 1

, list the range of the domain

-2 \leq x \leq 2

, where x is an integer.

{-9, -1, 2,3, 4}
{-9, -2, 0, 1, 7}
{-5, -4, -3, -2}
{-9, -5, -1, 3, 7}

Solution:

The elements of x are {-2, -1, 0, 1, 2}

$y = 4x - 1$ = 4(-2) - 1 = -9; 4(-1) - 1 = -5; 4(0) - 1 = -1; 4(1) - 1 = 3; 4(2) - 1 = 7.

The range of x is {-9, -5, -1, 3 7}.

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