SOLUTION: What substitution should be used to rewrite 4x4 – 21x2 + 20 = 0 as a quadratic equation?

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Question 945695: What substitution should be used to rewrite 4x4 – 21x2 + 20 = 0 as a quadratic equation?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
4x4–21x2+20=0

Use proper text notation.
4x^4–21x^2+20=0

That will appear rendered as
4x%5E4-21x%5E2%2B20=0


Use any preferred different variable, u=x%5E2.