jdeleon22 jdeleon22

04-04-2019
Mathematics

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If f(x) = 5x + 4, which of the following is the inverse of f(x)?

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starlipika starlipika

05-04-2019

set f(x) equal to y

y = 5x + 4

swap x and y

x = 5y + 4

make y the subject

x - 4 = 5y

[tex]y = \frac{x - 4}{5} [/tex]

replace y with f^-1(x)

[tex]f(x) = \frac{x - 4}{5} [/tex]

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