Question

x^88 + 1/x^88=5
x^88 - 1/x^88=?​

Answer 1

Answer:

√21

Step-by-step explanation:

let x^88 = k

now k + 1/k = 5

(k - 1/k)^2 = (k + 1/k)^2 - 4k(1/k)

(k - 1/k)^2 = 5^2 - 4

(k - 1/k)^2 = 21

(k - 1/k) = √21

x^88 - 1/x^88= √21