Finding all inverses Find all the inverses associated with the following functions, and state their domains.

ƒ(x) = (x + 1)³

Guida verificata passo dopo passo

Step 1: To find the inverse of the function $ f(x) = (x + 1)^3 $, start by replacing $ f(x) $ with $ y $. This gives us the equation $ y = (x + 1)^3 $.

Step 2: Swap the variables $ x $ and $ y $ to begin solving for the inverse. This results in the equation $ x = (y + 1)^3 $.

Step 3: Solve for $ y $ by taking the cube root of both sides to isolate $ y + 1 $. This gives $ \sqrt[3]{x} = y + 1 $.

Step 4: Isolate $ y $ by subtracting 1 from both sides of the equation. This results in $ y = \sqrt[3]{x} - 1 $.

Step 5: The inverse function is $ f^{-1}(x) = \sqrt[3]{x} - 1 $. The domain of the inverse function is all real numbers, $ \mathbb{R} $, since the cube root function is defined for all real numbers.

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Inverse Functions

An inverse function essentially reverses the effect of the original function. If a function f takes an input x and produces an output y, the inverse function f⁻¹ takes y back to x. For a function to have an inverse, it must be one-to-one, meaning each output is produced by exactly one input.

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Finding Inverses Algebraically

To find the inverse of a function algebraically, you typically replace f(x) with y, then solve for x in terms of y. After isolating x, you swap x and y to express the inverse function. This process often involves algebraic manipulation and may require checking for restrictions on the domain.

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Domain and Range

The domain of a function is the set of all possible input values (x-values), while the range is the set of all possible output values (y-values). When finding the inverse of a function, the domain of the original function becomes the range of the inverse, and vice versa. Understanding these concepts is crucial for accurately determining the domains of both the original and inverse functions.

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