Q. For the function f(x)=x+102x−9, find f−1(x).Answer: f−1(x)=
Replace with y: To find the inverse function, f−1(x), we need to switch the roles of x and y in the original function and then solve for y. Let's start by replacing f(x) with y to make it easier to work with.y=x+102x−9
Switch x and y: Now, switch x and y to find the inverse function.x=y+102y−9
Multiply by (y+10): Next, we need to solve for y. To do this, we'll multiply both sides of the equation by (y+10) to get rid of the fraction.x(y+10)=2y−9
Distribute x: Distribute x on the left side of the equation.xy+10x=2y−9
Move terms: To solve for y, we need to get all the y terms on one side and the constant terms on the other. Let's move the terms involving y to the left side and the constant terms to the right side.xy−2y=−10x−9
Factor out y: Factor out y from the left side of the equation.y(x−2)=−10x−9
Divide by (x−2): Now, divide both sides by (x−2) to solve for y.y=x−2−10x−9
Final Inverse Function: We have found the inverse function. Therefore, f−1(x) is:f−1(x)=x−2−10x−9
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