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