dtan5457
  • dtan5457
If f(x)=2x-5 and g(x)=(1+3x)/(5-2x) compute g(f^-1(z))
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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freckles
  • freckles
well first solve y=2x-5 for x
dtan5457
  • dtan5457
y=(x+5)/2
freckles
  • freckles
cool \[f^{-1}(x)=\frac{x+5}{2} \\ \text{ so } f^{-1}(z)=\frac{z+5}{2}\]

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freckles
  • freckles
\[g(\frac{z+5}{2})=?\]
freckles
  • freckles
just replace all of those x's in that g thingy with (z+5)/2
dtan5457
  • dtan5457
i got 17+3z/(-2z)
freckles
  • freckles
\[\frac{1+3\frac{z+5}{2}}{5-2 \frac{z+5}{2}} \\ \frac{1+\frac{3(z+5)}{2}}{5-(z+5)} \\ \frac{1+\frac{3(z+5)}{2}}{5-z-5}\] did you get that far?
freckles
  • freckles
\[\frac{1+\frac{3(z+5)}{2}}{-z}\] yep what you have seems right good job
dtan5457
  • dtan5457
thanks again

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