Practicing Success
If x5 + x4 + x3 + x2 + x = 0 find x1000 + x100 + x10 |
1 2 0 3 |
3 |
x5 + x4 + x3 + x2 + x = 0 This equation is in G.P. x5 = first term \(\frac{1}{x}\) = common ratio then first term \(\frac{ { \left(Common ratio \right) }^{n} -1 }{(Common ratio - 1)}\) ⇒ x5\(\frac{ { \left({ \left(\frac{1}{x}\right) }^{5}-1 \right)}}{\frac{1}{x}-1}\) = 1 1 - x5 = 0 x5 = 1 Put in find \( { \left(x^5\right) }^{200} \) + \( { \left(x^5\right) }^{20} \) + \( { \left(x^5\right) }^{2} \) = 1 +1 +1 = 3 |