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BECE Mathematics 2012 Paper

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Question : 12

Total: 40

Find the image of 3 under the mapping,

x \rightarrow 10-2x

4
5
8
16

Solution:

Concept:

The image of a number under a mapping is found by substituting the number for

x

in the given expression.

Explanation:

The mapping is

x \rightarrow 10 - 2x

.

To find the image of

3

, substitute

x = 3

into the mapping.

So,

3 \rightarrow 10 - 2(3)

.

First, multiply:

2 \times 3 = 6

.

Then, subtract:

10 - 6 = 4

.

Thus, the image of

3

is

4

.

Answer:

4

(Option A).

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