\(\frac{x}{3}\) + 1 = \(\frac{-3}{x}\) find x5 - 26x2 + 3x + 14
Answer & explanation
Correct answer: option 3
\(\frac{x}{3}+1 = \frac{-3}{x}\), \(\frac{x}{3}+\frac{3}{x}\) = -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