Practicing Success
If $(x + \frac{1}{x}) = 8.5$, what is the value of $(x^2 + \frac{1}{x^2})$ ? |
70.25 74.25 72.25 75.25 |
70.25 |
If $K+\frac{1}{K}=n$ then, $K^2+\frac{1}{K^2}$ = n2 – 2 × k × \(\frac{1}{k}\) If $(x + \frac{1}{x}) = 8.5$ $(x^2 + \frac{1}{x^2})$ = (8.5)2 – 2 $(x^2 + \frac{1}{x^2})$ = 72.25 - 2 = 70.25 |