SOLUTION: How to solve x^1/2-x^1/4-6=0 by substitution?

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Question 1080407: How to solve x^1/2-x^1/4-6=0 by substitution?
Answer by ikleyn(52798)   (Show Source): You can put this solution on YOUR website!
.
Introduce new variable u = .

Then your original equation takes the form

 = 0.

Factor left side:

(u-3)*(u+1) = 0.


Its roots are u= 3 and u= -2.

Since u = , you need only positive u = 3.

Then x =  = 81.


Answer.  x = 81.

Solved.


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