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For the function 
f(x)=7x^((1)/(5)), find 
f^(-1)(x).

f^(-1)(x)=(7x)^(5)

f^(-1)(x)=(x^(5))/(7)

f^(-1)(x)=((x)/(7))^(5)

f^(-1)(x)=(x^((1)/(5)))/(7)

For the function f(x)=7x15 f(x)=7 x^{\frac{1}{5}} , find f1(x) f^{-1}(x) .\newlinef1(x)=(7x)5 f^{-1}(x)=(7 x)^{5} \newlinef1(x)=x57 f^{-1}(x)=\frac{x^{5}}{7} \newlinef1(x)=(x7)5 f^{-1}(x)=\left(\frac{x}{7}\right)^{5} \newlinef1(x)=x157 f^{-1}(x)=\frac{x^{\frac{1}{5}}}{7}

Full solution

Q. For the function f(x)=7x15 f(x)=7 x^{\frac{1}{5}} , find f1(x) f^{-1}(x) .\newlinef1(x)=(7x)5 f^{-1}(x)=(7 x)^{5} \newlinef1(x)=x57 f^{-1}(x)=\frac{x^{5}}{7} \newlinef1(x)=(x7)5 f^{-1}(x)=\left(\frac{x}{7}\right)^{5} \newlinef1(x)=x157 f^{-1}(x)=\frac{x^{\frac{1}{5}}}{7}
  1. Rewrite with yy: To find the inverse function, f1(x)f^{-1}(x), we need to switch the roles of xx and yy in the original function and then solve for yy. Let's start by rewriting the function with yy instead of f(x)f(x):\newliney=7x15y = 7x^{\frac{1}{5}}
  2. Interchange x and y: Now, interchange x and y to find the inverse function: x=7y15x = 7y^{\frac{1}{5}}
  3. 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 55 to get rid of the exponent on the right side:\newlinex5=(7y1/5)5x^5 = (7y^{1/5})^5
  4. Simplify right side: Simplifying the right side of the equation by raising both the base and the exponent to the power of 55, we get:\newlinex5=75×yx^5 = 7^5 \times y
  5. Divide by constant: Now, divide both sides of the equation by 757^5 to solve for yy: \newliney=x575y = \frac{x^5}{7^5}
  6. Final inverse function: Since 757^5 is just a constant, we can simplify the expression by writing it as y=x575y = \frac{x^5}{7^5}. However, 757^5 is a large number, and it's more convenient to leave it as 77 to indicate the operation that needs to be performed. So, the inverse function is:\newlinef1(x)=x57f^{-1}(x) = \frac{x^5}{7}

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