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Question

If f:AA defined by f(x)=4x+36x4 where A=R23. Find f1

A
2x
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B
4x+36x4
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C
x2
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D
None of these
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Solution

The correct option is B 4x+36x4
f(x)=4x+36x4lety=4x+36x46xy4y=4x+36xy4x=3+4yx(6y4)=3+4yx=3+4y6y4Replacexbyy&ybyx.y=3+4x6x4f(x)=4x+36x4

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