Given a function: ๐(๐ฅ) = ๐ฅ2 + 2.a. Does ๐(๐ฅ) has an inverse for all values of ๐ฅ.b. Find a possible largest domain where ๐(๐ฅ) has an inverse. Then find the inversefunction ๐โ1(๐ฅ).c. What is the domain and range of ๐โ1(๐ฅ)
Question
Given a function: ๐(๐ฅ) = ๐ฅ2 + 2.a. Does ๐(๐ฅ) has an inverse for all values of ๐ฅ.b. Find a possible largest domain where ๐(๐ฅ) has an inverse. Then find the inversefunction ๐โ1(๐ฅ).c. What is the domain and range of ๐โ1(๐ฅ)
Solution
a. The function ๐(๐ฅ) = ๐ฅยฒ + 2 does not have an inverse for all values of ๐ฅ. This is because the function is not one-to-one, meaning that there are multiple values of ๐ฅ that can produce the same output.
b. The largest possible domain where ๐(๐ฅ) has an inverse is when ๐ฅ โฅ 0. This is because for ๐ฅ โฅ 0, the function ๐(๐ฅ) is one-to-one and therefore has an inverse. The inverse function ๐โ1(๐ฅ) can be found by swapping ๐ฅ and ๐ฆ in the original equation and solving for ๐ฆ:
๐ฅ = ๐ฆยฒ + 2 ๐ฆยฒ = ๐ฅ - 2 ๐ฆ = sqrt(๐ฅ - 2)
So, ๐โ1(๐ฅ) = sqrt(๐ฅ - 2).
c. The domain of ๐โ1(๐ฅ) is ๐ฅ โฅ 2, because the square root of a negative number is not a real number. The range of ๐โ1(๐ฅ) is ๐ฆ โฅ 0, because the square root of a number is always nonnegative.
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