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Find the inverse of f(x) = 7x+4

To start make the equation equal y.

So y = 7x+4

Then rearrange the equation to make x the subject.

Subtract 4 from both sides: y-4 = 7x

Divide by 7: (y-4)/7 = x

Now write it in terms of x

f(x)^-1 = (x-4)/7

where f(x)^-1 means the inverse of f(x).

Joe S. A Level Computing tutor, GCSE ICT tutor, GCSE Maths tutor, GCS...

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