21- If x- - 1-x- - 15-4 - then the value of x- - 1-x- is -x - 0- -1- -63-8 -2- 17-4 -3- 63-8 -4- -110

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Identity (x+y)(x-y)

21. If x² + 1...

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21. If x² + 1/x² = 15/4 , then the value of x² - 1/x³ is (x > 0) (1) -63/8 (2) 17/4 (3) 63/8 (4) -110

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