SOLUTION: Find the value of x^4+1/x^4 when x+1/x=2.Show solution without calculator 2 4 8 16

Question 1133481: Find the value of x^4+1/x^4 when x+1/x=2.Show solution without calculator
2
4
8
16
Answer by Edwin McCravy(20054) (Show Source): You can put this solution on YOUR website!

The easiest way is just to solve  for x
and substitute in 



Multiply through by x













Substitute in 









--------------------------

But maybe you meant "without solving for x". If so, then:



Square both sides:









Square both sides:









That was done without solving for x.

Edwin

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