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14 September, 22:25

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

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  1. 14 September, 22:48
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    u = x²

    Step-by-step explanation:

    4x⁴ - 21x² + 20 = 0

    4 (x²) ² - 21x² + 20 = 0

    If we substitute u = x²:

    4u² - 21u + 20 = 0
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