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9 August, 19:01

Factor x^4+6x^2-7 completely.

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  1. 9 August, 19:46
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    Lets change x²=y, so we have equation y²+6y-7 = (y-1) (y+7)

    make change back so (y-1) (y+7) = (x²-1) (x²+7) = (x²-1²) (x²+7) = (x+1) (x-1) (x²+7)
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