Question 1141405: How do I solve for x or even turn x^1/2-9x^1/4+20=0 into a quadratic equation? none of my books would give me a similar example. Found 2 solutions by josgarithmetic, greenestamps:Answer by josgarithmetic(39617) (Show Source):
x^(1/2) is the square of x^(1/4); so this is a quadratic equation in which the "variable" is x^(1/4). With experience most students can solve it in its given form. But for most students it helps to define a new variable y=x^(1/4). Then the equation is
That equation is easily solved by factoring.
(Then remember the values of y are not the answers to the original question....)