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25 May, 03:43

8. Find all the real fourth roots of 256

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  1. 25 May, 06:34
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    X^4=256

    x^4-256=0

    (x^2) ^2 - (16) ^2=0

    (x^2+16) (x^2-16) = 0

    either x^2+16=0

    it gives complex roots.

    or x^2-16=0

    or x^2-4^2=0

    (x+4) (x-4) = 0

    either x+4=0, x=-4

    or x-4=0

    x=4
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