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BECE Mathematics 2022 Paper

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Question : 13

Total: 40

The rule of mapping is

x \rightarrow 2x^2 - 1

. What number does

x = 2

9
8
7
3

Solution:

Concept:

A mapping rule gives the output value when a specific input

x

is substituted into the given expression.

Explanation:

The mapping is

x \rightarrow 2x^2 - 1

.

To find the image of

x = 2

, substitute

2

in place of

x

.

2(2)^2 - 1 = 2 \times 4 - 1

2 \times 4 = 8

8 - 1 = 7

So

x = 2

maps to

7

.

Answer:

Option C. 7

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