SOLUTION: f(x)=x^4-18x^2+4 Find all the points of inflection. Please help!

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Question 56888: f(x)=x^4-18x^2+4

Find all the points of inflection.
Please help!
Answer by Scriptor(36) About Me  (Show Source):
You can put this solution on YOUR website!
Substitute x^2 for t to obtain: g(t)= t^2 - 18t + 4.
Solve this for t and take the roots to find x.