Question

if x^3+(1/x^3)=110, then x+(1/x)=



can someone explain this easily?​

Answer 1

Answer:

X³ + 1/x³ = 110

(x + 1/x)³ - 3(x + 1/x) = 110

x + 1/x = k let

k³ - 3k - 110 = 0

k(k² - 3) = 110

k(k² - 3) = 5(5² - 3)

so k = 5 ANSWER

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Answer 2

Step-by-step explanation:

X^3 +1/x^3 =110

(x+1/x^3) - 3(x+1/x) = 110

x+1/x = k (let)

k^3 - 3k - 110 = 0

k(k^2-3) = 110

k(k^2 - 3) = 110

k(k^2 - 3) = 5(5^2-3)

So k = 5 ANSWER.