algebra

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find the real number solutions of the equation.

w^4+w^3-w=1

could you please show step by step..thank you

  • algebra -

    is it only 1 b/c if u substitute 1 into w, it'll equal to 1

  • algebra -

    w^4+w^3-w=1
    w^4+w^3-w-1=0
    (w-1)(w^3+2w^2+2w+1)=0
    (w-1)(w+1)(w^2+w+1)=0

    so real solutions are 1 and -1
    complex solutions are 1 -1 j j^2 with j=exp(2Pi/3)

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