Q. For the function f(x)=7x51, find f−1(x).f−1(x)=(7x)5f−1(x)=7x5f−1(x)=(7x)5f−1(x)=7x51
Rewrite 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 rewriting the function with y instead of f(x):y=7x51
Interchange x and y: Now, interchange x and y to find the inverse function: x=7y51
Isolate y: To solve for y, we need to isolate y on one side of the equation. First, we'll raise both sides of the equation to the power of 5 to get rid of the exponent on the right side:x5=(7y1/5)5
Simplify right side: Simplifying the right side of the equation by raising both the base and the exponent to the power of 5, we get:x5=75×y
Divide by constant: Now, divide both sides of the equation by 75 to solve for y: y=75x5
Final inverse function: Since 75 is just a constant, we can simplify the expression by writing it as y=75x5. However, 75 is a large number, and it's more convenient to leave it as 7 to indicate the operation that needs to be performed. So, the inverse function is:f−1(x)=7x5
More problems from Multiplication with rational exponents