\(\frac{x}{3}\) + 1 = \(\frac{-3}{x}\) find x5 - 26x2 + 3x + 14 |
20 0 5 4 |
5 |
\(\frac{x}{3}+1 = \frac{-3}{x}\), \(\frac{x}{3}+\frac{3}{x}\) = -1, x2 + 3x = -9 we know that if x + \(\frac{1}{x}\) = -1 then x3 = 1 so, \(\frac{x}{3}+\frac{3}{x}\) = -1 \( { \left(\frac{x}{3}\right) }^{3 } \) = 1 x3 = 27 Put in find x2(x3 - 26) + 3x + 14 x2(27 - 26) + 3x + 14 x2 + 3x + 14 -9 + 14 (∵ x2 + 3x = -9) 5 |