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  • 11-06-2022
  • Mathematics
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Whats the inverse of f(x) = 4^x+2x

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Аноним Аноним
  • 11-06-2022
  • y=4^x+2x

Interchange x and y

[tex]\\ \rm\Rrightarrow x=4^y+2y[/tex]

Find y

[tex]\\ \rm\Rrightarrow 4^y=\dfrac{x}{2y}[/tex]

take log on both

[tex]\\ \rm\Rrightarrow ln4^y=ln\dfrac{x}{2y}[/tex]

[tex]\\ \rm\Rrightarrow yln4=lnx-ln2y[/tex]

[tex]\\ \rm\Rrightarrow yln4-ln2y=lnx[/tex]

[tex]\\ \rm\Rrightarrow yln4-ln2-lny=lnx[/tex]

[tex]\\ \rm\Rrightarrow yln4-lny=lnx+ln2[/tex]

Inverse not possible to find

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