Question 69If $x^{6}=64$ and $\left(\frac{2}{x}-\frac{x}{2}\right)^{2}=b$, then a function $f$ that satisfies $f(b+1)=0$ is$f(x)=1-2^{x-1}$$f(x)=x^{2}+x$$f(x)=2^{x-1}$$f(x)=2 x-1$