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Mathematics, 25.06.2019 23:30 zibnmustafah

What substitution should be used to rewrite 4x^4-21x^2+20=0 as a quadratic equation


What substitution should be used to rewrite 4x^4-21x^2+20=0 as a quadratic equation

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What substitution should be used to rewrite 4x^4-21x^2+20=0 as a quadratic equation
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