Question

if X - 1 upon x equal to 4 find the X squre + 1 upon X squre =

Answer 1

x - 1/x = 4 ---------------(1)

using this formule , (a -b )² = a² + b² - 2ab

(x - 1/x )² = ( x²+ 1/x ² - 2(x)(1/x) )

4² = x² + 1/x² - 2

16+ 2 = x² + 1/x²

18 = x² + 1/x²

Answer 2

Here is the answer....

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