Q. Find the inverse function of the function f(x)=21x+2.f−1(x)=2x−2f−1(x)=21x−2f−1(x)=2x−4f−1(x)=21x−4
Understand the problem: Understand the problem.We need to find the inverse function of f(x)=21x+2. The inverse function, denoted as f−1(x), will undo the operation done by f(x). To find the inverse, we will switch the roles of x and y and solve for y.
Replace with y: Replace f(x) with y.Let y=21x+2. This is the first step in finding the inverse function.
Swap x and y: Swap x and y. Now we will replace y with x and x with y to find the inverse function. So we get x=(21)y+2.
Solve for y: Solve for y.To solve for y, we need to isolate y on one side of the equation. First, we subtract 2 from both sides to get x−2=(21)y.
Multiply by 2: Multiply both sides by 2.To get y by itself, we multiply both sides of the equation by 2. This gives us 2(x−2)=y.
Distribute and simplify: Distribute and simplify.We distribute the 2 on the left side of the equation to get 2x−4=y.
Write inverse function: Write the inverse function.Now that we have y by itself, we can write the inverse function as f−1(x)=2x−4.
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