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Given that๐‘“(๐‘ฅ)=2๐‘ฅโˆ’3 and ๐‘”(๐‘ฅ)=1โˆ’๐‘ฅ4solve (๐‘“โˆ˜๐‘”โˆ’1)(๐‘ฅ)=(๐‘“โˆ˜๐‘”)(๐‘ฅ).

Question

Given that๐‘“(๐‘ฅ)=2๐‘ฅโˆ’3 and ๐‘”(๐‘ฅ)=1โˆ’๐‘ฅ4solve (๐‘“โˆ˜๐‘”โˆ’1)(๐‘ฅ)=(๐‘“โˆ˜๐‘”)(๐‘ฅ).

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Solution

To solve the equation (๐‘“โˆ˜๐‘”โˆ’1)(๐‘ฅ)=(๐‘“โˆ˜๐‘”)(๐‘ฅ), we first need to understand what the notation means.

The notation (๐‘“โˆ˜๐‘”)(๐‘ฅ) means f(g(x)), i.e., the function f is applied to the result of function g(x). Similarly, (๐‘“โˆ˜๐‘”โˆ’1)(๐‘ฅ) means f(g^(-1)(x)), i.e., the function f is applied to the inverse of function g(x).

Given ๐‘“(๐‘ฅ)=2๐‘ฅโˆ’3 and ๐‘”(๐‘ฅ)=1โˆ’๐‘ฅ^4, we can write:

(๐‘“โˆ˜๐‘”)(๐‘ฅ) = f(g(x)) = 2(1-x^4) - 3 = 2 - 2x^4 - 3 = -2x^4 - 1.

To find (๐‘“โˆ˜๐‘”โˆ’1)(๐‘ฅ), we first need to find the inverse of g(x), g^(-1)(x).

The function ๐‘”(๐‘ฅ)=1โˆ’๐‘ฅ^4 can be rewritten as x = sqrt[4]{1 - g}, so g^(-1)(x) = sqrt[4]{1 - x}.

Then, (๐‘“โˆ˜๐‘”โˆ’1)(๐‘ฅ) = f(g^(-1)(x)) = 2sqrt[4]{1 - x} - 3.

Setting (๐‘“โˆ˜๐‘”โˆ’1)(๐‘ฅ) = (๐‘“โˆ˜๐‘”)(๐‘ฅ), we get:

-2x^4 - 1 = 2sqrt[4]{1 - x} - 3.

Solving this equation will give us the value(s) of x that satisfy the equation. However, this is a complex equation that may not have a simple algebraic solution. It may require numerical methods to solve.

This problem has been solved

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