If x + 1/x = 8, then find the value of 5xx^2 + 1 - 6x.

Answer: Option A

$$\begin{array}{rl}& x+\frac{1}{x}=8\\ & x^2+1=8x\\ & \frac{5x}{x^2+1-6x}\\ & =\frac{5x}{8x-6x}\\ & =\frac{5x}{2x}\\ & =\frac{5}{2}\\ & =2.5\end{array}$$