Q. For the function f(x)=3+4x9−2x, 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=3+4x9−2x
Interchange x and y: Now, interchange x and y to find the inverse function.x=3+4y9−2y
Multiply both sides: Next, we need to solve for y. To do this, we'll multiply both sides of the equation by (3+4y) to eliminate the denominator.x(3+4y)=9−2y
Distribute x: Distribute x on the left side of the equation.3x+4xy=9−2y
Move terms with y: Now, we want to get all the terms with y on one side and the constant terms on the other side. Let's move the terms involving y to the left side and the constant terms to the right side.4xy+2y=9−3x
Factor out y: Factor out y from the left side of the equation.y(4x+2)=9−3x
Divide both sides: Divide both sides by (4x+2) to solve for y.y=4x+29−3x
Write inverse function: Now that we have solved for y, we can write the inverse function. Replace y with f−1(x) to denote the inverse function.f−1(x)=4x+29−3x
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