Please cooperate guys, I want the answer ASAP .. If x²+1/x²=47, then find the value of x³+1/x³..
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(x+1/x) ² = x² + 1/x² + 2 = 47 + 2 = 49
(x+1/x) = +- 7
x³ + 1/x³ = (x+1/x)(x² - x.1/x + 1/x²) = ( +- 7 ) (x² + 1/x² - 1)
= (+-7) (47 - 1) = (-+7) (46) = +- 322
Hope this helps.
(x+1/x) = +- 7
x³ + 1/x³ = (x+1/x)(x² - x.1/x + 1/x²) = ( +- 7 ) (x² + 1/x² - 1)
= (+-7) (47 - 1) = (-+7) (46) = +- 322
Hope this helps.
parisakura98pari:
Thanks.
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