Mathematics, 17.07.2019 05:30 anthonymw

What substitution should be used to rewrite 4x4 – 21x2 + 20 = 0 as a quadratic equation? u = x2 u = 2x2 u = x4 u = 4x4

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