Practicing Success
If 2a - \(\frac{2}{a}\) + 4 = 0 Find a3 - \(\frac{1}{a^3}\) + 14 |
-14 0 -12 14 |
0 |
Given, 2a - \(\frac{2}{a}\) + 4 = 0 2 (a - \(\frac{1}{a}\)) = -4 a - \(\frac{1}{a}\) = -2 a3 - \(\frac{1}{a^3}\) = (-2)3 + 3 × - 2 = -14 So, a3 - \(\frac{1}{a^3}\) + 14 = -14 + 14 = 0
Note → a - \(\frac{1}{a}\) = L, then a3 - \(\frac{1}{a^3}\) = L3 + 3L |