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Question

Which of the following function satisfies the given mapping diagram?

A
y=x2+x
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B
y=x(x+1)
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C
y=x3+x2x
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Solution

The correct option is C y=x3+x2x
Given that
Domain:{4,5,6,7}
Range:{20,42,30,56}

On checking through given options,
Option(a)–––––––––: y=x2+x
Here, we need to put the mapped values of domain and range in x & y
20=42+4,30=52+5, 42=62+6,56=72+7
Hence, y=x2+x satisfies given mapping diagram.

Option(b)–––––––––: y=x(x+1)=x2+x

Option(c)–––––––––: y=x3+x2x=x2+x

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