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faust18 [17]
3 years ago
15

. Find the inverse of each function.

Mathematics
1 answer:
Evgesh-ka [11]3 years ago
5 0

Answer:

a. f^{-1}(x)=\dfrac{x+3}{2}

b. g^{-1}(x) =e^{\frac{x}{2}}+1

c. h^{-1}(x)=\dfrac{e^{y}}{e^{y}-1}

d. k^{-1}(x)=-\dfrac{2log(5-y)}{log(3)}

Step-by-step explanation:

Here is the procediment for each case.

a. f(x)=2x-3 as we know f(x)=y then y=2x-3 finding the expresion of x, we find the inverse of the function, then:

y=2x-3\\y+3=2x\\\\\dfrac{y+3}{2}=x

Then:

f^{-1}(x)=\dfrac{x+3}{2}

b. g(x)=2log(x-1) for this we have to remember that the inverse function of the log is the exp, then:

g(x) = 2 log(x-1)\\y=2log(x-1)\\\\\\\dfrac{y}{2}=log(x-1)\\\\e^{\frac{y}{2}}=e^{log(x-1)}\\\\e^{\frac{y}{2}}=x-1\\e^{\frac{y}{2}}+1=x

Then the inverse function is:

g^{-1}(x) =e^{\frac{x}{2}}+1

c. In this case we have to also remember the relation between the e and the ln, then:

h(x) = ln(x)-ln(x-1)  with the properties of the ln we have:

h(x) = ln(x)-ln(x-1)=ln\left(\dfrac{x}{x-1}\right) now finding the inverse function we have:

h(x)=ln\left(\dfrac{x}{x-1}\right)\\\\y=ln\left(\dfrac{x}{x-1}\right)\\\\e^{y}=e^{ln\left(\dfrac{x}{x-1}\right)}\\\\\\e^{y}=\dfrac{x}{x-1}}\\\\e^{y}(x-1)=x\\e^{y}x-e^{y}=x\\e^{y}x-x=e^{y}\\x(e^{y}-1)=e^{y}\\x=\dfrac{e^{y}}{e^{y}-1}

then:

h^{-1}(x)=\dfrac{e^{y}}{e^{y}-1}

d. in the last one we have: k(x) =5-3^{-x/2} then:

k(x) =5-3^{-x/2}\\y =5-3^{-x/2}\\y-5=-3^{-x/2}\\5-y=3^{-x/2}\\log(5-y)=log(3^{-x/2})\\log(5-y)=-\frac{x}{2}log(3)\\-2log(5-y)=xlog(3)\\-\dfrac{2log(5-y)}{log(3)}=x

then:

k^{-1}(x)=-\dfrac{2log(5-y)}{log(3)}

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