Question

if x²+1/x²=23, find the value of 8x3-27y3+90xy+115​​

Answer 1

Answer:

Let

x - 1/x = y

SQUARING BOTH SIDE'S

( x -1/x )² = y²

=>

x² + 1/x² - 2 = y²

=>

y² = 23 - 2

=>

y² = 21

=>

y = +√21

OR

y = -√21

=>

(x - 1/x) = √21

OR

(x - 1/x) = -√21

Explanation:

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