terence696988 terence696988

20-03-2018
Mathematics

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if f(x)=5x, what is f-1(x)

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jsims3712 jsims3712

20-03-2018

f=5 and x stands for itself so it should be 5-1(x) which equals 4x

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Bladerunner1976 Bladerunner1976

20-03-2018

You can say f(x) = 5x is the same as saying y = 5x to find f^-1 you need to 1st switch the x and y and solve for y

x = 5y
y = [tex] \frac{1}{5} x[/tex] = [tex] f^{-1} (x)[/tex]

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