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Let f: R → R: f(x) = 10x + 3. Find f-1.

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It is given that

f(x) = 10x + 3

Consider y = 10x + 3

It can be written as

y – 3 = 10x

On further calculation

x = (y – 3)/ 10

So we get

-1 (y) = (y – 3)/ 10

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