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6 March, 21:29

Where is substitution should be used to rewrite 4x^4-21x^2+20=0

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  1. 6 March, 21:49
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    u = x²

    Step-by-step explanation:

    4x⁴ - 21x² + 20 = 0

    Substitute u = x² to turn the equation into a quadratic.

    4u² - 21u + 20 = 0

    You can solve by factoring.

    (4u - 5) (u - 4) = 0

    u = 5/4 or 4

    x² = 5/4 or 4

    x = ±½√5 or ±2
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