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OpenStudy (anonymous):
what substitution should be used to rewrite 4x^4-21x^2+20=0 a. u=x^2 b u= 2x^2 c u=x^4 d u=4x^4
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OpenStudy (anonymous):
as a quadratic equation
OpenStudy (midhun.madhu1987):
|dw:1416844671586:dw|
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