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Given a function: ๐‘“(๐‘ฅ) = ๐‘ฅ2 + 2.a. Does ๐‘“(๐‘ฅ) has an inverse for all values of ๐‘ฅ.b. Find a possible largest domain where ๐‘“(๐‘ฅ) has an inverse. Then find the inversefunction ๐‘“โˆ’1(๐‘ฅ).c. What is the domain and range of ๐‘“โˆ’1(๐‘ฅ)

Question

Given a function: ๐‘“(๐‘ฅ) = ๐‘ฅ2 + 2.a. Does ๐‘“(๐‘ฅ) has an inverse for all values of ๐‘ฅ.b. Find a possible largest domain where ๐‘“(๐‘ฅ) has an inverse. Then find the inversefunction ๐‘“โˆ’1(๐‘ฅ).c. What is the domain and range of ๐‘“โˆ’1(๐‘ฅ)

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Solution

a. The function ๐‘“(๐‘ฅ) = ๐‘ฅยฒ + 2 does not have an inverse for all values of ๐‘ฅ. This is because the function is not one-to-one, meaning that there are multiple values of ๐‘ฅ that can produce the same output.

b. The largest possible domain where ๐‘“(๐‘ฅ) has an inverse is when ๐‘ฅ โ‰ฅ 0. This is because for ๐‘ฅ โ‰ฅ 0, the function ๐‘“(๐‘ฅ) is one-to-one and therefore has an inverse. The inverse function ๐‘“โˆ’1(๐‘ฅ) can be found by swapping ๐‘ฅ and ๐‘ฆ in the original equation and solving for ๐‘ฆ:

๐‘ฅ = ๐‘ฆยฒ + 2 ๐‘ฆยฒ = ๐‘ฅ - 2 ๐‘ฆ = sqrt(๐‘ฅ - 2)

So, ๐‘“โˆ’1(๐‘ฅ) = sqrt(๐‘ฅ - 2).

c. The domain of ๐‘“โˆ’1(๐‘ฅ) is ๐‘ฅ โ‰ฅ 2, because the square root of a negative number is not a real number. The range of ๐‘“โˆ’1(๐‘ฅ) is ๐‘ฆ โ‰ฅ 0, because the square root of a number is always nonnegative.

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